Walker played in 12 games and had 15 tackles and 2.5 sacks as a freshman for the Bulldogs in 2019.[5] As a sophomore in 2020, he played in nine games with 13 tackles, one sack and one interception.[6][7] Walker started at defensive tackle as a junior and was a part of the team that won the 2022 College Football Playoff National Championship.[8] He declared for the 2022 NFL draft following the season.[9]
Walker was selected first overall by the Jacksonville Jaguars in the 2022 NFL draft.[13] He signed his four-year rookie contract, worth $37.4 million fully guaranteed, on May 12, 2022.[14] In his debut, Walker recorded a sack and interception in a 28–22 loss against the Washington Commanders.[15] In his rookie season, he started in 14 of the 15 games he appeared in. He finished with 3.5 sacks, 49 total tackles, one interception, two passes defensed, and one forced fumble.[16]
During a Week 5 game against the Buffalo Bills, he recorded the first fumble recovery of his career. In a 26–0 win over the Carolina Panthers in Week 16, Walker recorded two sacks and six tackles, including two tackles for a loss.[17] Walker finished the 2023 season with 52 tackles, ten sacks, two pass deflections, and a fumble recovery.[18]
On April 7, 2025, the Jaguars picked up the fifth-year option on Walker's contract.[19]
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