Former Northwestern defensive end Corey Wootton announced his retirement from the NFL on Twitter on Tuesday morning, after spending six seasons with the Chicago Bears, Detroit Lions and Minnesota Vikings.

After being tabbed to a number of watch lists prior to his senior season with the Wildcats, and an All-Big Ten selection his junior year, Wootton finished his college career with 156 total tackles (94 solo), 19.5 sacks, 38.0 tackles for a loss, four interceptions and one forced fumble.

After totaling 6.0 TFL and 4.0 sacks his senior season, Wootton was invited to the Senior Bowl and the NFL Combine in Indianapolis before he was drafted in the fourth round of the 2010 NFL Draft by the Chicago Bears with the 109th overall selection.

Wootton played four seasons with the Bears, recording 11.0 sacks and 54 tackles, before signing with the Vikings as a free agent after the 2013 season. Wootton played one season with Minnesota, coming off the bench to record one sack, before he continued his time in the NFC North with the Detroit Lions, where he was released prior to the 2015 season.

He finishes his NFL career with 12.0 sacks, 65 tackles, 7 passes defended, three forced fumbles and two fumble recoveries in 60 games played including 22 starts.

Wootton joins a growing list of players that have retired from the NFL prior to the age of 30 amid growing concerns regarding concussions and CTE.