Philadelphia police are hoping a grainy video will help them find the killer of a man who alleged before he died last year that former Colts wide receiver Marvin Harrison helped arrange the hit. No other evidence has surfaced to support the claim of Dwight Dixon, a 33-year-old ex-con who lapsed into a coma after he was shot July 21, 2009, and died six weeks later. According to two law enforcement sources, the July 21 video shows a gunman approach the driver's side of Dixon's Toyota Camry and shoot him five times. The shooting occurred shortly before noon on the corner of 28th Street and Girard Avenue in North Philadelphia, roughly a block from Playmakers, a bar owned by Harrison.