The Brief A 17-year-old is facing murder charges in connection to a mass shooting in Philadelphia on Fourth of July weekend. The teen suspect became the fourth person arrested in the mass shooting. A 17-year-old is facing murder charges two months after a mass shooting on Fourth of July weekend in Philadelphia that left three dead and nine injured. Officials say Fischer faces several charges, including murder, attempted murder, and weapons offenses. Fischer became the fourth – and youngest – suspect arrested in connection to the July 7 mass shooting on the 1500 block of South Etting Street.