Dave Martin/Associated Press

Authorities in Dallas have arrested Thomas Linze Johnson, a former member of the Texas A&M football team, on suspicion of murder after he allegedly stabbed a jogger to death Monday morning, per Tristan Hallman of the Dallas Morning News.

Hallman posted a photo of the crime scene:

"It appears that Mr. Johnson picked this victim at random. It's absolutely random," Dallas police Deputy Chief Rob Sherwin said in a press conference, per Jeff Smith and Frank Heinz of NBC 5 in Dallas-Fort Worth. "He just attacked him. He told our homicide detectives that he was angry about a situation and he just picked somebody to murder. I believe there's more to that story. It's just very unusual. It's quite shocking."

Johnson, 21, only played one season with the Aggies, leaving the school in December 2012. Roughly a month earlier, he had gone missing from the A&M campus in mysterious circumstances only to be found in Dallas three days after his disappearance.

In April 2014, his mother, Linda Hanks, told Brent Zwerneman of the San Antonio Express-News that Johnson was working on a comeback to the football field.