He played college baseball at Washington State University, and was selected by the Giants in the 31st round of the 2018 MLB draft.
In 20 games between the three, Walker registered a 2.51 earned run average (ERA) with 31 strikeouts and three saves in 32+1⁄3 innings pitched.
He pitched in 37 games (8th in the South Atlantic League) and logging a 3.36 ERA with 61 strikeouts and seven saves in 59 innings of work.
[7] Walker returned to action in 2021, playing for the High-A Eugene Emeralds and Double-A Richmond Flying Squirrels.
[10] Walker returned to Sacramento to begin the 2023 season, where he made 15 appearances and recorded an excellent 0.89 ERA with 23 strikeouts and one save in 20+1⁄3 innings pitched.