A 19-year-old basketball player from Queens was fatally stabbed with a broken-off table leg today after a fight broke out during a basketball tournament, the police said.

The player, Lloyd Newton, was stabbed in the back with a leg from the scorer's table at the championship game of a Y.M.C.A.-sponsored tournament at the Niagara Falls Boys and Girls Club, the police in Niagara Falls said.

"An argument ensued about the score," Capt. Louis Curcione said, adding that one of the teams "thought they were getting gypped."

"A fight broke out between the players and about 40 fans in the stands," he said. "In the course of the fight, one person was stabbed in the back."