Walker was raised in Indianapolis, Indiana and attended Arsenal Technical High School in Indianapolis.[3] During his senior season, he won the Indianapolis Coaches Association Player of the Year.[3] His senior season averages were 24.3 points, 5.6 assists and three steals per game.[3]
Walker played in 33 games off the bench during his freshman year, averaging 4.9 points, 1.3 assists, and 0.6 steals per game.[4] His season-high in points during the season was 13, against Illinois and Wake Forest.[5] He started every game except for one during his sophomore season at Florida State, averaging 8 points, 2.4 assists, and 1 steal per game.[4] He started every game of Florida State's Elite Eight run during the 2018 NCAA tournament, averaging 17.5 minutes per game.[6] Following the season, on March 27, 2018, he transferred from Florida State.[7]
Ohio State
Walker committed to Ohio State on April 8, 2018.[8] Walker sat out the 2018–19 season due to NCAA transfer rules.[9] He had a solid season during his junior season, averaging 8.7 points, 3.5 assists, and 1.3 steals per game.[4] He scored a season-high 18 points in a game against Nebraska on January 14, 2020.[10]
Walker missed four games during mid-January due to a nagging hand injury.[11] In Ohio State's Big Ten tournament championship loss, Walker scored 16 points and made a buzzer-beating three-pointer, although the three-pointer did not affect the result of the game as Illinois won the game by three points.[12] He averaged 9.5 points, 4.4 assists, and 0.9 steals per game.[4] His free throw percentage of 94.0% ranked second in the country.[13]
Walker declared for the 2021 NBA draft on April 12, 2021, forgoing his option to return to college by hiring an agent.[14]
Walker has a daughter, Summer, in 2019 from a previous Relationship. He is married to Taylor Ramey in 2022 and they had a son in 2023, Skylar.[17] Walker serves as an assistant coach for the Girls Varsity basketball team at North Central High School in Indianapolis, Indiana.