Conversation so far:
What was Joan Rivers greatest achievement in the 1990s
Joan Rivers starred in the made-for-television comedy How to Murder a Millionaire.
what was the good thing about the show How to Murder a Millionaire?
Joan Rivers took on the role of a Beverly Hills matron possessed with the idea her husband is trying to kill her.
Did Joan Rivers star in anything else in the 1990s?
Joan Rivers starred in a play about Bruce's mother Sally Marr.
Did Joan Rivers act in other TV shows?
Joan Rivers received five additional Emmy nominations for her daytime talk-show The Joan Rivers Show.

Question: Who did she costar with in Bruce's mother?
Self-contained rewrite: Who did Joan Rivers costar with in Bruce's mother?