He played college football at Tulsa and signed with the New Orleans Saints as an undrafted free agent in 2012.
[6] In the 2014 season, Walker played all 16 games, starting one, and tallied 19 tackles, 2.5 sacks, and one forced fumble.
[6] Walker recorded one tackle in the Lions' wild-card round game as they lost to the Seattle Seahawks by a score of 26–6.
[6] Walker recorded three tackles in the Rams' wild-card round game as they lost to the Atlanta Falcons by a score of 26-13.
[17] On January 15, 2019, Walker was signed by the New Orleans Saints after defensive tackle Sheldon Rankins was injured during a playoff game against the Philadelphia Eagles.