Walker played for Edina High School for four seasons, finishing with 167 points.

In his full collegiate tenure with the Golden Gophers he became the first three-year captain in school history.

After his collegiate career, Walker opted to become a free agent after declining to sign with draft club, the Tampa Bay Lightning.

On August 18, 2022, he opted to sign with home state team, the Minnesota Wild, in agreeing to a two-year, entry-level contract.

On February 4, 2025, Walker was traded by the Wild to the Utah Hockey Club in exchange for future considerations.