Walker was selected with the 5th pick of the
1986 NBA draft by the New York Knicks. Walker played for five coaches in five years with the Knicks. On February 11, 1989, Walker won the
NBA Slam Dunk Contest, competing three days after the death of his father. He also secured third place in the 1990 contest. However, his success on the court was dwindling, and knee injuries forced him to leave the NBA and join the
ACB league in Spain. Walker returned to the NBA in 1993 to play two seasons with the
Washington Bullets as a role player. He played a season (c.1998) for the
Isuzu Motors Lynx/Giga Cats in Japan before retiring from professional basketball. ==Post-retirement==