Jeff Sperbeck, John Elway‘s longtime agent and friend, has died at 62 years old, officials announced on Wednesday.

Sperbeck’s time of death was listed as 1:10 AM.

As we previously reported, Jeff was on life support following Saturday’s accident … where he suffered a traumatic brain injury after falling off a golf cart that Elway was driving.

We’re told Elway, Sperbeck, their wives, and John’s son were on their way back from a post-Stagecoach party around 7 PM on April 26 … when Jeff fell off the back of the cart, hitting his head on the ground, and suffering a traumatic brain injury.

Police initially didn’t respond to the scene — a majority of law enforcement were working the massive music festival nearby — but have since launched an investigation into the incident.

As we previously reported, John was the one who made the 911 call … in a frantic effort to save his friend.

Elway and Sperbeck not only had a long-term working relationship which started in the early 1990s, but later became business partners in a winery, and best buds.