Another horse was euthanized at Churchill Downs Friday afternoon.Related video above: 8th horse dies at Churchill Downs after suffering an injuryAccording to spokesperson Darren Rodgers, Lost in Limbo suffered a significant injury to his left front leg near the finish of Friday's seventh race.Dr. Will Farmer, Equine Medical Director, determined that the injury was unrecoverable, and the horse was humanely euthanized.This is the 10th horse death at Churchill Downs since start of the Spring Meet less than a month ago.Three-year-old filly, Swanson Lake, trained by Michael McCarthy was euthanized after being vanned off with a significant injury during a race on Sunday. Before Swanson Lake's death, eight other horses died at Churchill Downs during the course of the month.