Actress Liz Sheridan, best known for playing Jerry Seinfeld’s mother Helen on Seinfeld, has died of natural causes at age 93.

Deadline reports that Sheridan died on Friday at her home in New York City, with her longtime friend and representative Amanda Hendon confirming that she died in her sleep. Born April 10, 1929 in Rye, New York, she is survived by her daughter and son-in-law. 

Outside of her role as Helen Seinfeld, an overly protective mother who frequently questioned how anyone could dislike her son, she also appeared in episodes of NBC’s ALF as Raquel Ochmonek. Additionally, she voiced Mrs. Stillman in Louise Anderson’s animated sitcom, Life with Louie. Other notable credits include guest roles on The A-Team, Newhart, Murder, She Wrote, and Moonlighting. She has over 80 TV and film credits to her name, and last acted in front of the camera in 2010.

She was also an accomplished stage actor, and once acted opposite Christopher Lloyd and Meryl Streep in the ‘77 musical Happy End. She was a go-go-dancer in the ‘50s, too, and wrote a book about her romance with James Dean entitled Dizzy and Jimmy: My Life with James Dean. She met the iconic actor when he was 21-years-old.

The news comes just weeks after fellow Seinfeld actor Estelle Harris, who played George Costanza’s mother, died from natural causes at age 93 at her home in Palm Desert, California. Sheridan was the last surviving cast member to play a parent of one of the main characters on the show.