He averaged 18 points, 11 rebounds, five assists, 2.4 steals and 2.3 blocks per game and was named class 4A All-State as a junior.

[7] Walsh committed to playing college basketball for Arkansas over offers from Texas, Memphis, Arizona State, and Kansas.

[10] Eventually, thanks to his length and athleticism, Walsh moved back to the starting lineup and became one of Arkansas' key defenders.

[15][16] On January 17, 2024, Walsh made his NBA debut in a 117–98 victory against the San Antonio Spurs, collecting 4 rebounds in the final 3 minutes of play.

[17] On February 4, 2024, Walsh scored his first two NBA points in a 131–91 victory against the Memphis Grizzlies at TD Garden.