The passer-by who confronted and killed the gunman in last Friday's police shooting was an expert marksman who used to alarm his neighbors by firing guns on his own property, court records show. "I am an ex-Marine and an expert shot. I don't miss what I shoot at," Gregory Floyd, 49, told police officers who searched his home in 1997. Authorities have decided not to charge Floyd in Friday's shooting, ruling he was justified when he fired at Liko Kenney, 24, just moments after watching Kenney shoot and kill Franconia Police Cpl. Bruce McKay. Kenney's uncle, Bill, said he is...