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Liz Sheridan, who played Helen Seinfeld, Jerry Seinfeld’s mother on Seinfeld, passed away on Friday (April 15th) at the age of 93. In addition to her work on the famous sitcom, Sheridan appeared in several Broadway shows, and she played Raquel Ochmonek on ALF from 1986-1990, among other roles. The news of Sheridan’s passing comes just a week after Estelle Harris, who played George Castanza’s mother Estelle on Seinfeld, passed away as well.