Sad to hear. I remember some of his WWF matches from the late 80's - when he crushed Damien (Jake's snake), and his feud with Hogan before forming the Natural Disasters with Typhoon (formerly Tugboat).
Hart set up a Dino Bravo/Ultimate Warrior push-up contest and they picked the biggest guy out of the audience they could find to sit on their backs during the push ups...which was of course ended up picking John Tenta, posing as Joe Everyday Fan, but ended up being a plant of Jimmy Hart's and he squashed the Ultimate Warrior.