An investigation is ongoing into the death of a 19-year-old woman in Rohnert Park. Police say the woman, a Forestville resident, was staying the night with some friends at a home on Arlen Drive when she was found unresponsive on the couch Thursday morning. Her friends reportedly attempted CPR but were unable to revive her. Police responded to the scene and attempted life-saving measures, but she was pronounced dead at the scene. A sudden death like this is uncommon, and police are investigating the home where she died and performing an autopsy.