LAS VEGAS (AP) — A good Samaritan could not save a Las Vegas woman screaming for help as her gun-wielding estranged husband chased her from their home to two drug store parking lots in a chaotic murder-suicide that left a family of five dead, authorities said Thursday. The man gunned down his wife outside a business and killed their children, ages 9 to 15, at their apartment before shooting himself at the residence, police said. The Clark County coroner's office identified the couple's children, including 15-year-old daughter, Dalavanh Ariel Dej-Oudom, and sons, Xonajuk J.J.