Moses Malone, a three-time NBA MVP, Hall of Famer and 13-time All-Star, died on Sunday at the age of 60.

Fellow Hall-of-Famer Calvin Murphy said Malone died in his sleep from an apparent heart attack, according to FOX26 sports director Mark Berman. Malone was to play in a golf tournament in Norfolk, Va. with Murphy.

Malone, nicknamed the “Chairman of the Boards” for his rebounding dominance, won a title with the Philadelphia 76ers in 1983 and made the All-Star game 12 times in a row, from 1978-1989. During 21 seasons playing pro basketball, the 6-10 center averaged 20.3 points and 12.3 rebounds per game.

Malone’s 29,580 total points ranks seventh all-time, his 17,834 rebounds is third all-time and his 1,889 blocks is 23rd all-time.

The first player to go pro directly from high school, Malone debuted during the 1974-75 season for the Utah Stars of the ABA. He played the next season with the ABA’s Spirits of St. Louis before beginning an NBA trek through Buffalo, Houston, Philadelphia, Washington, Atlanta, Milwaukee and San Antonio.

Malone led the NBA in rebounds per game in 1978-79 and every season from 1980-81 to 1984-85.

He was inducted into the Hall of Fame in 2001.