Walker, 27, originally signed on with the Saints as an undrafted free agent out of Tulsa back in 2012. After two years in New Orleans, Walker signed a one-year, $1.75 million deal with the Lions back in March of 2015 and later returned to Detroit on another one-year contract.
In 2016, Walker appeared in 15 games for the Lions and recorded 24 tackles, no sacks and a fumble recovery. Pro Football Focus has him rated as the No. 77 interior defender out of 127 qualifying players.