He played the Doctor paid for by Jack Nickolson for Helen Hunt's son in "As Good As It Gets".
He was a major player and creator over the years, his movies influenced a lot of things along the way...Animal House will ALWAYS be funny 'til the PC Monster destroys rude humor.
(Belushi with a mouthful of mashed potatos ..."what am I?" ...and his one raised eyebrow...priceless!
"Did you say "over"? ... Was it over when the Germans bombed Pearl Harbor?")
RIP good buddy.