Dozens of police and emergency vehicles, their lights flashing, escorted an ambulance carrying the officer from the shooting scene after nightfall. Some residents stood along the route, their arms raised in salute.
As of late Monday, the identities of the other nine victims were not disclosed as police were still notifying their family members.
What was the motive behind the deadly attack?
Police provided no immediate information on a possible motive for the rampage and were unable to say whether the shooter knew any of his victims or had ties to the store.
It also remains unclear whether the attack started inside the store or in the parking lot where witnesses said they saw victims down.
Video footage showed some windows of the market blown out. KMGH television news in Colorado reported that as police arrived at the store they, too, came under fire.
SWAT teams and armored police vehicles arrived. A bystander live-streamed video showing police outside the market on a megaphone urging the shooter to give up: "The entire building is surrounded," announced an officer. "You need to surrender. Come out with your hands up, unarmed."
The suspect's identity was not immediately divulged, but officials said he was the only person to receive non-fatal injuries in the saga.