Riverside County (California) Sheriff Chad Bianco told Denver TV station 9NEWS that the investigation into Sperbeck's death has concluded. Sperbeck, 62, died after he fell from the golf cart and hit his head April 26 in La Quinta, California. Bianco previously told ESPN that Sperbeck had been standing on the back of the golf cart before he fell. The Riverside County Coroner's Bureau determined Sperbeck's death was caused by blunt force trauma and ruled his manner of death an accident, 9NEWS reported. "I am absolutely devastated and heartbroken by the passing of my close friend, business partner and agent Jeff Sperbeck," Elway said in a statement after Sperbeck's death.