Shelton, 27, is a former first-round pick out of Washington by the Browns in the 2015 NFL Draft. The Patriots acquired Shelton and a 2018 fifth-round pick from the Browns in exchange for a third-round pick in 2018.
New England declined his fifth-year option and Shelton played out the final year of his four-year $11.703 million rookie contract that included a $6.771 million signing bonus. The Patriots ultimately ended up bringing him back on a one-year deal for 2019.
Shelton signed a two-year, $8 million deal with the Lions this past offseason.
In 2020, Shelton appeared in 11 games for the Lions and recorded 36 tackles, one sack and one pass defense. Pro Football Focus has him rated as the No. 104 interior defensive lineman out of 127 qualifying players.