Oklahoma running back Daniel Brooks announced he's retiring from football on Friday morning.
The cause, which was first reported by SoonerScoop.com, is concussions.
Brooks is the third OU player this season to retire because of concussions. He joins offensive lineman Jamal Danley and linebacker Tay Evans.
Brooks was mostly a backup in his time with the Sooners, rushing for 176 yards on 34 carries before his senior season. Brooks played in two games this season.
He didn't score a touchdown in his career.
Oklahoma's running back depth is suddenly a question mark. The Sooners now have just true freshman Abdul Adams behind starters Joe Mixon and Samaje Perine.