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 3rd 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 (1998) in Japan before retiring from professional basketball.
Career highlights and awards
NBA Slam Dunk Contest champion (1989)
Consensus first team All-American (1986)
Consensus second team All-American (1985)
2× SEC Player of the Year (1985–1986)
No. 34 retired by University of Kentucky
Men’s basketball Competitor for United States
FIBA U19 World Championship
Gold medal – first place 1983 Palma de Mallorca National team