He was also host of The Sports Reporters.
"He was one of the most significant and influential members of the ESPN family, as a colleague and mentor, and he will be sorely missed.
"As the studio host of NBA Shootaround, a play-by-play announcer for nationally televised NBA and WNBA games and one of the Toronto Raptors' first television voices, John was a vital member of the NBA family for more than two decades and was a friendly and familiar face to our players and fans.
He was always willing to share and give, and he played a vital role in the success of helping so many.
"Professionally he was always willing to be out of the limelight, but make no mistake.