John A. Austin, 26, of 1408 Chapin St. NW was convicted yesterday by a D.C. Superior Court jury of the murder of a Southeast Washington man who was killed during the 1977 robbery of an illegal dice game.

Austin, who was sentenced to life in prison for a separate murder conviction earlier this year, was one of three men, one armed with a shotgun and the other two with pistols, who approached a group of men playing craps in the 1200 block of Stevens Road SE, on Aug. 1977, according to government witnesses.

Witnesses testified that Austin and the two other men -- who have never been identified or apprehended -- announced their plans to commit robbery to the craps players and ordered them to stand.

Gordon Page, a resident of the 1200 block of Stevens Road, was shot and killed by Austin with a shotgun blast in the chest as he complied with the holdup men's order, witnesses testified.

Attorney James E. Joyner, who represented Austin, argued that his client was not a participant in the incident.

Austin is awaiting prosecution in Fairfax County where he is charged with slashing the throats of two men and two women also in August 1977, after seven men robbed the victims.