Short answers, pulled from the story.
Jean Doumanian took over as executive producer after Lorne Michaels departed following five successful seasons. She hired an entirely new group of performers to replace the original cast members known as the Not Ready for Prime Time Players.
Eddie Murphy joined Saturday Night Live as a featured player starting with the fourth episode in September 1980. He began at nineteen years old after begging producer Neil Levy to give him a chance despite initial rejection.
Charles Rocket appeared in a wheelchair during a parody sketch titled Who Shot C.R.? on the 21st of February 1981 and used profanity while in character. NBC president Brandon Tartikoff fired Doumanian immediately following this incident because control room director Dave Wilson walked out of the room.
Eddie Murphy became the sole repertory player to survive Dick Ebersol's complete retooling of the cast. Joe Piscopo also survived the transition alongside Murphy while most other hires including Gilbert Gottfried Ann Risley and Charles Rocket were fired.
The show went on hiatus when Al Franken and Tom Davis mailed their written material to themselves to prove compliance with strike rules. Ebersol called off the rest of the season after seeing copies of the content he had promised them could host the premiere that fall.