He received an invitation to the NFL combine, but was unable to perform any drills besides the bench press due to a torn ACL in his left knee that he suffered in November.
On April 5, 2017, he attended LSU's pro day along with Leonard Fournette, Malachi Dupre, Jamal Adams, Ethan Pocic, Duke Riley, Tre'Davious White, and 11 other players.
Head coach Dirk Koetter named him the starting strong side linebacker to begin the regular season.
He made his professional regular season debut and his first career start during the Buccaneers' season-opener against the Chicago Bears and recorded five solo tackles and deflected a pass in the 29–7 home victory at Raymond James Stadium.
[9] On April 12, 2018, Beckwith was in a car accident with former LSU teammate Lamin Barrow and suffered a fractured ankle which required surgery.