Investigation into golf cart accident that left NFL legend John Elway's agent dead remains open

Deputies successful California volition support unfastened an probe into a play cart mishap reportedly involving Denver Broncos fable John Elway but accidental each witnesses person been interviewed, and thing indicates foul play was involved.

TMZ reported John Elway was driving a play cart astatine The Madison Club successful La Quinta, California, April 26 erstwhile his longtime cause and friend, Jeffrey Sperbeck, 62, fell retired and deed his head.

The 2 were leaving a Stagecoach after-party, the outlet reported.

A spokesperson for Cal Fire told Fox News Digital Sperbeck sustained "serious injuries" and was transported to a hospital. He was initially listed successful captious condition, but helium died April 30.

CORONER REVEALS JEFF SPERBECK, JOHN ELWAY'S FORMER AGENT, CAUSE OF DEATH FOLLOWING GOLF CART CRASH

Denver Broncos fable John Elway was driving a play cart erstwhile his cause fell retired and struck his head, TMZ reported. (Isaiah J. Downing/USA Today Sports)

Riverside County Sheriff Chad Bianco told Fox News Digital the lawsuit volition stay unfastened until each residents who whitethorn person video are contacted, but there's thing indicating foul play.

"We determined the lawsuit would stay unfastened until we contacted each residents who mightiness person video of the way traveled.  All imaginable witnesses person been interviewed. There is nary grounds oregon connection to bespeak this is thing much than a tragic accident," Bianco said.

The Riverside County Sheriff's Office Coroner's Bureau antecedently ruled Sperbeck's decease accidental, saying his decease was the effect of blunt caput trauma, according to a connection obtained by Fox News Digital.

The coroner's bureau said the wounded happened erstwhile the "passenger fell from" the play cart.

'STRANGE' HANDLING OF JOHN ELWAY GOLF CART INCIDENT CALLED OUT BY EX-PROSECUTOR WHO SAYS MISTAKES WERE MADE

John Elway said helium was "devastated" by his friend's death. (Kirby Lee/USA Today Sports)

In a connection released aft Sperbeck's death, Elway said helium was "devastated," according to ESPN.

"I americium perfectly devastated and heartbroken by the passing of my adjacent friend, concern spouse and cause Jeff Sperbeck," Elway said. "There are nary words to genuinely explicit the profound sadness I consciousness with the abrupt nonaccomplishment of idiosyncratic who has meant truthful overmuch to me."

Sperbeck's household besides released a statement.

"We are profoundly saddened to stock the passing of our beloved Jeff Sperbeck. He was a fantastic father, husband, brother, lad and person to galore and volition beryllium profoundly missed by all," the Sperbeck household said. "We are grieving this unimaginable nonaccomplishment arsenic a household alongside our dearest friends the Elway’s and the galore different clients Jeff called friends."

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John Elway warms up earlier the Super Bowl against the Atlanta Falcons successful Miami Jan. 31, 1999. (Robert Deutsch/USA Today Network via Imagn Images)

Sperbeck became Elway's manager successful 1990. Among Sperbeck's clients were Pro Football Hall of Famers Ronnie Lott and Jim Plunkett, successful summation to hundreds of different NFL players.

Fox News' Chantz Martin and Scott Thompson contributed to this report.