Jeff Sperbeck, John Elway's longtime agent and friend, is being remembered by his family after his death ... they say he was a wonderful man.
Jeff's wife, Cori, and the Sperbeck family tell TMZ ... "We are deeply saddened to share the passing of our beloved Jeff Sperbeck. He was a wonderful father, husband, brother, son and friend to many and will be profoundly missed by all."
The family adds .