(08/09/10) GRAND CONCOURSE - After a spree of violence this past weekend, a murder victim's family is begging his killer to come forward.

Police say Demetrius Jones, 19, was shot and killed during a house party inside a vacant apartment at 14-54 Grand Concourse over the weekend. His family believes an uninvited guest at the party is responsible for the shootings.Violence across the borough killed two other people over the weekend and injured more than a dozen.