ARLINGTON, Texas — Defensive back Justus Parker will not return for his senior season.

Head coach Matt Wells announcing at Big 12 Media Day that the NCAA suspended Parker for one season.

On Tuesday, Parker announced on Twitter that it was a result of a failed drug test for a banned substance.

As a sophomore, Parker was named All-Big 12 second team after racking up 42 tackles, four interceptions and forced four fumbles in his first year with the team.

Parker entered last season as preseason All-Big 12 selection and finished in junior campaign with 18 tackles and one sack.