Riverdale police confirmed Monday they are investigating a homicide stemming from a weekend domestic dispute. Police said a 911 call came in at 10:52 p.m. Sunday from a man who stated he had shot his knife-wielding girlfriend. He claimed the shooting was in self-defense. Officers arrived to find the 30-year-old woman inside a home, address undisclosed, dead from what appeared to be multiple gunshot wounds. As of late Monday morning, no arrests had been made.