Police believe that a man jumped to his death on the Upper West Side this morning. The incident happened around 11:20 a.m. Saturday in front of 248 West 105th Street, on the corner of Broadway. Police at the scene were still trying to identify the victim, telling us "we really don't know yet what happened," but confirmed the victim is dead. They added that a witness saw him hit the pavement, and described seeing his body convulsing.