Her family told the Los Angeles Times she died last Saturday, but they did not disclose the cause of her death.
Although her screen credits included appearances in the films "Fatso" and "To Be or Not to Be," she is best known for her scene-stealing cameo in her son's 1989 romantic comedy "When Harry Met Sally." She was the woman who deadpanned the line, "I'll have what she's having," as star Meg Ryan enthusiastically faked an orgasm at a nearby table in a New York deli.
Estelle Reiner was married to Carl Reiner for 64 years at the time of her death.
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