St. John Medical Center in Tulsa says he died Friday morning.
The 6-foot-9 forward from Tulsa was a three-time All-American for Oklahoma. He spent 12 seasons in the NBA with the Indiana Pacers, Sacramento Kings and Phoenix Suns.
He first learned he had a cancerous cyst below his right knee after he broke his leg in a fall at his home in Los Angeles in 2007. His leg was amputated last August, but he had made several public appearances since.