MTV reality star Johnny Bananas was riding with John Elway and Jeff Sperbeck during the fatal golf cart accident, with sources telling TMZ Sports ... "The Challenge" competitor tried to keep the agent alive after he fell off the vehicle.
We spoke to someone familiar with the incident ... who tells us, Bananas -- real name Johnny Devenanzio -- and Sperbeck were standing on the back of the cart as Elway drove and his wife sat in the front seat.