New details emerge in the shocking death of John Elway's agent

was not a factor in the crash that led to the , sources told a local Denver news station as it pieces together the timeline of last month's tragedy.

Jeff Sperbeck, Elway's long-time agent and business partner, tragically died last week after succumbing to the traumatic injuries he sustained by falling off the back of a golf cart in La Quinta, four days earlier.

To add to the tragedy, the legendary quarterback had been the one driving the vehicle near The Madison Club. Others present included Elway's girlfriend, the Hall of Famer's son and daughter-in-law, as well as Sperbeck and his wife, Cori, .

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