He played at Marshall and was the 13th overall pick by the Nationals in the 1958 draft.
The Sixers will honor Greer before their playoff game against the Miami Heat on Monday night.
The Sixers said Greer was survived by his wife Mayme, a son and two daughters.
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In this file photo, Hal Greer (15), of the Philadelphia 76ers, accepts a ball from Sixers owner Irv Kosloff after Greer reached 20,001 points during a basketball game against the Milwaukee Bucks in Philadelphia, Pa. Greer, a Hall of Fame guard and the...