Key was selected in the third round and 87th overall. The defensive end appeared in 37 games during his three-year stint with the Raiders, but started 10 and recorded just three sacks.
Hurst was taken in the fifth round of that draft. The defensive tackle saw time in 40 games and put up eight sacks and 76 tackles.
Both were part of Reggie McKenzie's last draft class as general manager of the Raiders and Jon Gruden's first since returning to the sidelines. Of that nine-player class, only tackles Kolton Miller and Brandon Parker and wideout Marcell Ateman remain on the team.
Sloter signed on a futures contract in January.