Four people are dead after a suspected murder-suicide in Mosman Park. ABC NewsFour people are dead after a suspected murder-suicide in Mosman Park. ABC News Credit: ABCA family of four found dead after a suspected double murder-suicide in one of Perth’s most affluent suburbs have been identified. ABC News Credit: ABC“At this stage, there’s two parents and two children, so we will treat it as a double murder-suicide,” Inspector Securo said. What I can advise is that there was no weapon used during this incident, and the family have no reported family violence matters with police.