18-year-old Koty Walker of Jackson is listed in serious condition as of Monday afternoon.
He was taken to the University of Michigan hospital after a car accident early Saturday morning that killed three people.
Walker was initially in critical condition, and then listed in fair condition on Sunday.
The hospital cannot confirm if Walker has taken a turn for the worse or whether incorrect information was distributed on Sunday.
The Jackson County Sheriff's Office is currently investigating the crash, which happend on Maple Grove Road in Rives Township.
Killed in the crash were Benjamin Ojeda, 17, of Blackman Township; Stephen Horton, 17, of Jackson; and Marlina Sarata, 16, of Rives Township.