The Detroit Lions welcomed safety Jayron Kearse back to their active roster Thursday and waived running back Ty Johnson.
Kearse was reinstated this week from a three-game suspension for violating the NFL's policy on substances of abuse. He was arrested last October as a member of the Minnesota Vikings and charged with driving while impaired and possession of a firearm.
The Lions signed Kearse this offseason to play as a big safety on run downs and fill a special teams role.
Defensive coordinator Cory Undlin said Tuesday he was "very excited" to get Kearse back in the fold.