Definitely a sad day.
I feel his passing especially so because I'm also a big hockey fan, and he made the sport's all-time cult classic, "Slap Shot" in 1977. (In fact, it's been said that his character, Reg Dunlop, probably represented PLN as he really was more than any other character he ever played.)
I'm thinking of having vinyl decals made with "PLN" backed by a pair of crossed checkers. These will be for anyone who wants one, to be made available at the upcoming OVR regional races at MidOhio.
Just look for car number 91 (red Mustang) up on the hill. That's where the stickers will be.
RIP PLN.