Hall of Fame guard Paul Westphal was diagnosed with brain cancer.
Sportswriter Mike Lupica reported the news in a tweet.
The 69-year-old was inducted into the Hall of Fame in 2019.
Westphal, who averaged 15.6 points throughout his career, coached the Suns to the 1993 NBA Finals.
Westphal has a career coaching record of 318-279.