This, from all appearances and from all evidence, seems to just be a horrific accident,” Riverside County Sheriff Chad Bianco previously told The Denver Post.

Additional details, including the cause of death, regarding John Elway’s longtime friend and agent Jeff Sperbeck, have emerged this Friday.

Sperbeck died on April 30 from injuries sustained in the accident on April 26 in La Quinta, Calif.Jeff Sperbeck, John Elway's agent, died from blunt head trauma, the Riverside County Coroner Bureau confirmed to PEOPLESperbeck fell from a golf cart on April 26 in La Quinta,