We're learning more about the investigation into James and Jennifer Crumbley, the parents of the accused Oxford High School shooter, 15-year-old Ethan Crumbley.

The couple is facing involuntary manslaughter charges related to the shooting that left four students dead and seven other people injured. They were arrested at a building on Detroit's east side over the weekend.

The investigation has turned to the artist who owns the building. On Monday night, the Oakland County Sheriff's Office executed a search warrant at his home after he was questioned.

Now, we're learning that deputies found another vehicle the Crumbleys owned at a different hotel.

Police seized all of Andrezj Sikora's phones and computers, aiming to establish a timeline to see how much he knew and his true intentions to help the Crumbleys avoid arrest.

Deputies say he is cooperating.

"I believe at the end of the day they are going to conclude that he had no involvement with the Crumbleys," Sikora's attorney, Clarance Dass, said.

The 65-year-old owns an art studio, the same place Jame and Jennifer were found shacked up after failing to turn themselves into police.

Dass said Sikora didn't know the Crumbleys or their son were involved in the shooting at the high school. His attorney said he contacted the sheriff's office as soon as he did.

"He knows what he knows, and he knows that his involvement is so limited here, and most people don't go to the police voluntarily, and he did," Dass said.

James and Jennifer are facing four counts of involuntary manslaughter. Police say their son used a handgun they purchased to shoot up the school.

Dass said his client was trying to protect them from danger and not the police.

"The Crumbleys asked for a safe place to stay to avoid death threats that were surrounding their home," Dass said.

After a two-hour interview, deputies executed the search warrant and seized all his electronics.

Police are also looking into a second car belonging to the suspects parked at a different location than they were found.

"We uncovered a vehicle that the family also owned at a different hotel. There were a lot of things in motion here," Sheriff Michael Bouchard said. "The fact they were in a warehouse in a kind of an off-the-beaten-path in Detroit certainly is not indicative of someone who looked like they were going to surrender, in my experience."

Police will be checking Sikora's texts and phone records to see what kind of conversations he was having with the suspects before and after they were charged.

Staff at WXYZ in Detroit, Michigan, first reported this story.

Authorities executed a search warrant Monday at the home of the man who helped Ethan Crumbley's parents before they were arrested, Oakland County Undersheriff Michael G. McCabe told CNN.

Andrzej Sikora, 65, is being cooperative, McCabe said. He and his attorney, Clarence Dass, voluntarily went into the Oakland County Sheriff's Office where Sikora was interviewed for 90 minutes Monday. Sikora has not been charged with a crime.

Crumbley's parents, James and Jennifer Crumbley, were due to attend an arraignment Friday. Their failure to appear led authorities to search for the couple, who were found in an industrial building in nearby Detroit on Saturday.

Dass told CNN on Sunday his client knew the Crumbleys were using his workspace, but he "did not really know what was going on" and didn't know the couple "had active warrants" when they were discovered and subsequently arrested.

Sikora "got roped into it," Dass said, but he declined to say why he allowed the couple to stay in the workspace or provide additional details on their relationship other than to say "he knew them, but not well."

Ethan Crumbley, 15, is accused of fatally shooting four classmates and wounding several others at Oxford High School last week. His parents were charged with four counts of involuntary manslaughter in the same incident, CNN has reported. All three have pleaded not guilty.

Michigan Attorney General Dana Nessel told CNN's Dana Bash on Monday that while she doesn't have all the facts on the case, it does seem appropriate for the parents to face extra charges connected to the manhunt.

"If they are convicted, there are actually additional points that are scored for the obstruction of justice," Nessel said. "They're likely to get higher sentences and more time in the event they're convicted because of this."

School officials had legal grounds to search gunman, prosecutor says

School officials at Oxford High School had legal grounds to search Crumbley's backpack and locker, but did not do so on the day of the shooting, Oakland County Prosecutor Karen McDonald told CNN on Monday.

McDonald didn't say why such a search was not conducted, but noted, "We don't know exactly if that weapon was in his bag, where it was. We just know it was in the school and he had access to it."

When asked whether school staff members might be prosecuted, McDonald replied to CNN's Brianna Keilar, "We haven't ruled out charging anyone."

McDonald said the shooting last Tuesday could have been prevented and that the suspect's parents are being criminally prosecuted because "we have to start addressing how somebody like (Ethan Crumbley) can so easily get their hands on a weapon and we have to hold the people responsible who allowed that to happen."

"I'm sympathetic to parents. My husband and I have raised five children," McDonald said, adding, "I'm certainly not suggesting that parents should be criminally prosecuted for any bad act of a child. But in this case, you can't possibly look at their actions and say that they didn't have reason to believe that there was real concern about a violent act."

On the day of the shooting, Crumbley's parents met with school officials after a teacher became concerned by some of the teen's drawings and statements. But — because he had no prior infractions on his record — he was allowed to return to class.

"All of this could have been prevented if he hadn't had access (to a gun) or if just one of those parents had said, 'I'm concerned about what I'm seeing right now and I also want you to know we just bought him a gun for Christmas,' and that didn't happen," McDonald said.

State attorney general offers to investigate

Nessel is offering a team from her office to conduct a "full and comprehensive" review of the events that led up to the shooting, her office told CNN in an email on Monday.

The offer was made in response to a letter sent by Oxford Community Schools Superintendent Tim Throne to the school community Saturday saying the district would be requesting an independent review of the events surrounding the shooting.

Nessel was critical of the district's decision to hire a third party to conduct an investigation, saying in an interview with CNN affiliate WXYZ she does not find it appropriate.

"We've seen this happen before, and unfortunately, and I'm not accusing Oxford schools of anything, but in the past, we've seen this where it's really more of an effort to protect the client who hired you than to get to the truth of the matter," Nessel said.

CNN has reached out to the attorney general's office and the school district to determine what the next steps are.

Speaking with CNN's Dana Bash on Monday afternoon, Nessel said she hopes the shooting prompts state lawmakers to address Michigan's lack of a safe storage law.

"It seems like such a small inconvenience to safely store or secure your weapon to get a gun lock — which most police departments give away for free — in order to ensure that if you reside in a home where a child lives or is present, that that child cannot have unfettered access to that firearm," she said.

Parents, son being held in same jail

James and Jennifer Crumbley and their son were being housed at the same facility and monitored under suicide watch, authorities said.

Staff at the Oakland County Jail in Pontiac were checking on the three "multiple times an hour," Oakland County Sheriff Michael Bouchard said at a news conference Saturday.

Bouchard said the three are not able to communicate with each other in the jail. However, Ethan Crumbley is aware his parents are in custody, according to Paulette Michel Loftin, Crumbley's court-appointed attorney.

Loftin told CNN she met with the suspect twice and told him that his parents were in custody and at the jail.

Loftin said she has not yet seen any of the evidence that prosecutors have but expects to get it by Wednesday.

Loftin said Crumbley's next court date is Dec. 13 and will occur over Zoom. The proceeding will set a date for Crumbley's next court appearance and preliminary examination, during which prosecutors are expected to give even more evidence and the judge will decide to go forward with the trial.

Ethan Crumbley was charged as an adult Wednesday with terrorism, first-degree murder and other counts in the shooting that killed Madisyn Baldwin, 17; Tate Myre, 16; Hana St. Juliana, 14; and Justin Shilling, 17. In court Wednesday, a defense attorney submitted a plea of not guilty on his behalf.

James and Jennifer Crumbley have pleaded not guilty to the involuntary manslaughter charges, which were filed by prosecutors who allege they provided unrestricted access to the gun Ethan Crumbley is accused of using.

Reopening plan for schools 'evolving'

In a Sunday letter to the school community, Thorne said a reopening plan includes a "soft opening" with a law enforcement presence as well as trained clinicians to support students and staff.

"The plan for high school students is still evolving and we will communicate it to you once it is solidified. In the meantime, we are working to create opportunities for the students to be together in our community," Throne wrote.

Elementary schools and a few select programs will return Friday for a half day and next Monday, Dec. 13, for full days.

Oakland County Prosecutor Karen McDonald revealed what happened in the days leading up to the deadly Oxford High School shooting. She announced charges against the suspected shooter’s parents on Friday afternoon.

James Crumbley and Jennifer Crumbley are each facing four counts of involuntary manslaughter.

“Gun ownership is a right and with that right comes great responsibility,” said McDonald.

Officials say the gun used in the Nov. 30 attack was purchased by James Crumbley four days prior with his son present.

The suspect’s mother reportedly posted about the firearm on social media, saying, “Mom and son day, testing out his new Christmas present.”

The suspect also reportedly posted about the pistol, saying he got “his new beauty today.”

McDonald revealed that the day before the shooting, the suspect was reportedly searching for ammunition on his phone in class – when a teacher noticed. According to the prosecutor, a call and email allegedly went out to Jennifer about the incident, which was unanswered.

McDonald said Jennifer later texted her son about the incident, saying, “LOL, I’m not mad at you. You have to learn not to get caught.”

The following day of the shooting on Nov. 30, the prosecutor says the suspect was discovered drawing a disturbing note in class.

The drawings reportedly worried the teacher. McDonald said the suspect had pulled a gun pointing at the words, “the thoughts won’t stop, help me,” along with a drawing of a bullet with the words, “blood everywhere” and a drawing of a person who appeared to be shot twice near a laughing emoji and the words “my life is useless.”

The prosecutor said the suspect was called into a meeting with his parents at the school. McDonald said the suspect had already altered parts of the drawing at that time.

The parents were reportedly advised to get counseling for their son within 48 hours.

It was after that meeting that the suspect returned to class. The prosecutor said the parents failed to ask the suspect if he had the gun with him and failed to check his backpack.

“Of course, he shouldn’t have gone back to that classroom,” said McDonald at the press conference.

The shooting would unfold a short time later, leaving four people dead and seven injured. Tate Myre, 16, Madisyn Baldwin, 17, Hana St. Juliana, 14, and Justin Shilling, 17, lost their lives in the shooting.

The prosecutor said around 1:22 p.m. that day, Jennifer texted her son, “Ethan, don’t do it.”

About 10 minutes later, James reportedly called 911 to report a gun missing from their home. It was stored in an unlocked drawer in their bedroom, McDonald said.

“We need to do better in this country. We need to say enough is enough,” said the prosecutor.

Staff at Scripps station WXYZ first reported this story.

OXFORD, Mich. — The family of 17-year-old Justin Shilling, who was one of the four students killed in the Oxford High School shooting, has released a statement about their loved one, asking that the victims be the focus in the aftermath of the tragedy.

"The loss of Justin leaves such a gaping hole in our family that we cannot conceive of life without him," the statement reads. "Our hearts are broken and yet still go out to the other families suffering this very same loss at this very same moment and which is beyond imagination, nothing any family should have to endure."

They said Shilling was also an organ donor, continuing to give of himself even in death.

Read the full statement below:

Statement From the Shilling... by WXYZ-TV Channel 7 Detroit

Scripps Detroit station WXYZ first reported this story.

OXFORD TOWNSHIP, Mich. —

Ethan Crumbley, who is accused of killing four fellow students at a Michigan high school, will be tried as an adult and faces murder, assault and weapons charges.

He will also face one count of terrorism causing death, a rare charge for a school shooting.

The events unfolded Tuesday at Oxford High School when, law enforcement officials say, the 15-year-old shot at people in a school hallway, firing more than 30 shots at people and through classroom doors. Three people died Tuesday and another passed away at a hospital Wednesday.

Seven others -- six students and a teacher -- were wounded, Oakland County Sheriff Michael Bouchard said.

The county's top prosecutor addressed the terrorism charge.

"There is no playbook about how to prosecute a school shooting and candidly, I wish I'd never even had -- it didn't occur so I wouldn't have to consider it, but when we sat down, I wanted to make sure all of the victims were represented in the charges that we filed against this individual," Oakland County Prosecutor Karen McDonald told CNN. "If that's not terrorism, I don't know what is."

She said there is a lot of digital evidence in the case -- video and things on social media.

"But you probably don't even need to see that to know how terrifying it is to be in close proximity of another student shooting and killing fellow students. I mean, it's terror," she added.

"Like every other child that was in that building, and I address that about the terrorism charge, we must have an appropriate consequence that speaks for the victims that were not killed or injured but also, they were affected, how do they go back to school?"

She said many students can't eat or sleep.

"Their parents are sleeping next to them and we shouldn't ignore that," she told CNN. "There are obviously four children who were murdered and many others injured but over 1,000 were also victimized as well."

At Crumbley's arraignment Wednesday, prosecutor Marc Keast said Crumbley came out of a school bathroom and started firing. Crumbley walked down the hall at a "methodical pace" and fired more shots.

This continued for another four or five minutes and he went to another bathroom, Keast said. When deputies arrived, Crumbley put the gun down and surrendered, the prosecutor said.

The judge entered a plea of not guilty per his attorney's request.

Michigan law defines an act of terrorism as a "willful and deliberate act that is all of the following:"

"An act that would be a violent felony under the laws of this state, whether or not committed in this state.

"An act that the person knows or has reason to know is dangerous to human life.

"An act that is intended to intimidate or coerce a civilian population or influence or affect the conduct of government or a unit of government through intimidation or coercion."

The criminal complaint against Crumbley refers to the third condition and says the act was committed against the Oxford High School community.

Charging an accused school shooter with terrorism is rare. In 2018, an Ocala, Florida student who shot through a door and wounded another student, was charged with terrorism and later pleaded no contest to that count and other charges.

That incident occurred two months after gunman Nikolas Cruz shot more than 30 people as he moved for more than 10 minutes through Marjory Stoneman Douglas High School in Parkland, Florida.

Cruz was charged with 34 counts of premeditated murder and attempted murder. He did not face a terrorism charge. He recently pleaded guilty and is awaiting sentencing.

OAKLAND COUNTY, Mich. — The teenage suspect in Tuesday’s deadly school shooting in Michigan has been charged with four counts of first-degree murder.

Oakland County Prosecutor Karen McDonald announced the charges Wednesday against 15-year-old Ethan Crumbley, who is being charged as an adult.

McDonald said the teen also faces one count of terrorism causing death, seven counts of assault with intent to murder, and 12 counts of a firearm in the commission of a felony.

He was arraigned Wednesday afternoon. A not guilty plea was entered on his behalf. Bond was denied in the case.

"It's possible there could be additional charges very soon," McDonald said.

The suspect is accused of opening fire with 9mm Sig Sauer SP 2022 pistol at Oxford High School, killing four people and wounding seven others. The victims who have passed away have been identified as 16-year-old Tate Myre, 14-year-old Hana St. Juliana, 17-year-old Madisyn Baldwin, and 17-year-old Justin Shilling.

The prosecutor added that her office is considering charges against both of the suspected shooter's parents.

"We will be making a decision swiftly," she said regarding those possible charges.

During her remarks, McDonald advocated for responsible gun ownership.

“To prevent further tragedies like the one we witnessed yesterday, and at large, we have got to address responsible gun ownership in this country and in Oakland Country,” she said. “Responsible gun ownership, including the security of a gun, is an absolute imperative today and in the future. And for those who do not do that should be and will be held accountable.”

Authorities have said the suspect’s father purchased the gun that was used in the shooting four days prior. Officers found the teen with seven rounds in the 9mm pistol when they took him into custody.

McDonald did not reveal a possible motive for the shooting. However, the prosecutor said she believes the violence was premeditated, based on a “mountain of digital evidence” collected by law enforcement.

The Oakland County Sheriff's Office also provided an update on the case Wednesday afternoon.