Walker transferred to Kent State in 2021.[5] He made his collegiate debut in week one of the 2021 season, where he caught one pass for three yards, as Kent State was defeated by #6 Texas A&M 41–10.[6] In the team's bowl game, Walker caught one pass for 74 yards and a touchdown in Kent State's Golden Flashes' 52–38 loss against Wyoming.[7] Walker finished the 2021 season with five receptions for 124 yards and a touchdown.[8]
The 2022 season was a strong one for Walker. Against reigning national champions Georgia, Walker had one of the best performances of his career, with seven receptions for 106 yards and a touchdown, but Kent State lost to the Bulldogs 39–22.[9] Walker had good performances the following two weeks, catching six passes for 107 yards against Ohio,[10] and 11 receptions for 159 yards and two touchdowns in a loss to Miami (OH), 27–24.[11][12] In the team's season finale, Walker scored the game-winning touchdown, catching five passes for 84 yards, as Kent State ended the season with a win against Buffalo.[13][14]
Walker finished his 2022 season with 58 receptions for 921 yards and 11 touchdowns, while also adding 29 yards and a touchdown on the ground, and was named first team All-MAC.[15][16][17]
Following the conclusion of the season and departure of head coach Sean Lewis, Walker entered the transfer portal.[18]
North Carolina
After departing Kent State, Walker returned to his home state, transferring to North Carolina.[19][20] Walker was named to the 2023 Preseason All ACC Team.[21][22] In a controversial and highly criticized decision, the NCAA ruled Walker a two-time transfer, and he was initially denied eligibility for 2023.[23][24] After missing four games due to the issue, Walker's eligibility was reinstated for the remainder of the 2023 season.[25]
Walker returned to action against Syracuse and played in eight games, catching 41 passes for 699 yards and seven touchdowns. He caught six passes for 132 yards and three touchdowns in his second game back against Miami.[26] Walker declared for the NFL draft after the conclusion of the regular season, opting out of the Duke's Mayo Bowl in the process.[27]
Walker was drafted by the Baltimore Ravens in the fourth round, 113th overall, of the 2024 NFL draft.[30] The Ravens acquired the pick in a trade that sent Morgan Moses to the New York Jets.[31] On December 15, 2024, in a Week 15 game against the New York Giants, Walker caught his first NFL career reception and touchdown after Lamar Jackson threw a 21-yard pass on 3rd down. The Ravens would later defeat the Giants 35-14.[32]