 There had been tension between Chase and the rest of the cast since  the first season. John Belushi (qv) had a rivalry with Chase  dating back to their times at "The National Lampoon Radio Hour".  Reportedly, Belushi told Bill Murray that Chase had treated the cast  badly during his time on the show. Chase and Murray got into a  shouting match which turned into a fistfight. The fight was broken  up moments before the show went on the air. Murray said in the book  "Live From New York" that he felt he "was goaded into that...because  I was the new guy, and it was sort of like it was my job to do  that."