The Lions had an opening at the position after they lost starting middle linebacker Stephen Tulloch for the rest of the season due to a torn ACL. Tulloch injured himself while celebrating a sack in Detroit's victory over the Green Bay Packers on Sunday.
Bynes signed with the Ravens as an undrafted free agent in 2011. He had stints on the team's practice squad in 2011 and 2012 and has played in 26 games over three seasons, including nine starts. Bynes re-joined the practice squad after he was cut earlier this month.
The fourth-year pro is also known for making the final tackle in Super Bowl XLVII, preserving the Ravens' win over the San Francisco 49ers.
- Ben Estes and Sarah Barshop