A man died on a Queens subway platform after he was shot in the head midday on Sunday while quarreling with two men who fled on foot, the police said. The police have not identified the victim, who was pronounced dead on the platform and was not carrying identification. Officers were still searching for the gunmen, one of whom police described as a heavyset man wearing bluejeans and a blue jacket. The three men had been on board a southbound 7 train that pulled into the aboveground station just before 12:45 p.m. The conductor heard several shots, the police said, then saw the victim lying on the platform. Police officials were still trying to determine the nature of the dispute that led to the shooting. Investigators were examining video from the station, but it was unclear whether it captured the shooting or the suspects, the police said. Posted By PSmooth