I think the drugs and and an ABNormal mind might have had something to do with it. He could have gone and boiled himself in one of those nasty hot water ponds.
Yogi knows better to eat drug addicts

Watch out for the junkie bear in Yellowstone.
Gramps
Comedian Ron White has a funny, if graphic bit about getting eaten by a bear. The guy who gets eaten then has some harsh words for his father, who apparently told the guy that he would never 'amount to shit.'
"Oh, you were wrong, Papa, because tomorrow morning when this bear takes a dump, I will become a steaming pile of bear shit."
(Sounds funnier when Ron tells it)
But, seriously, aren't there easier ways to off yourself if that is your objective? How many bridges and overpasses would this guy have to cross to get to where he could find a hungry bear?