On June 26, 2024, Walter was selected with the 19th overall pick by the
Toronto Raptors in the
2024 NBA draft and on July 4, he signed with the team. However, he missed the beginning of the season, including training camp, because of an AC joint sprain. Throughout his rookie season, he has been
assigned several times to
Raptors 905. On November 1, 2024, Walter made his NBA debut and on November 27, he made his first NBA start in his career while achieving his first
double-double with 11 rebounds, 14 points and 5 assists in a 119–93 road win against the
New Orleans Pelicans. On December 22, he scored a career high of 27 points in a 114-110 home loss against the
Houston Rockets. On March 4, 2025, in a 114-113 win against the
Orlando Magic, Walter had 3 rebounds and scored 17 points, including the game-winning
three with 0.5 remaining on the clock in the 4th quarter. This propelled the Raptors to victory on the road at the
Kia Center. ==Career statistics==