Former Texas A&M wide receiver Thomas Johnson on Monday admitted to attacking and fatally stabbing a jogger along the White Rock Creek trail in Dallas.

According to Fox4News, the unstable Johnson called police and admitted to the killing shortly after it happened just after 8 a.m. local time. A witness says Johnson used what looked like a machete on an unidentified male and repeatedly struck him in the back of the neck.

Johnson withdrew from Texas A&M and left the team as a freshman in December 2012 a few weeks after he was reported missing on campus before being found in his hometown of Dallas.

“I think he’s trying to decide where he is, if he’s coming back, if he comes back next semester, if he’s going to take the year off or if he’s going to transfer,” Aggies coach Kevin Sumlin said at the time. “In my conversations with him that’s where he is. He’s just trying to figure out what his next step is going to be.”

As a freshman during Johnny Manziel’s Heisman season in 2012, Johnson caught 30 passes for 339 yards and a touchdown in 10 games.

Local police say Johnson was kicked out of his home over the weekend and was unstable.

“He was angry about his situation,” Dallas Police Department Deputy Chief Rob Sherwin told Fox4News. “It’s very unusual. It’s quite shocking.”