TMZ. The publication reports that she died at 2.30am on Friday, just five days after her 93rd birthday. Sheridan was the only non-central Seinfeld character to appear in the full run of the show, playing Jerry’s overprotective mother, appearing in 21 episodes. Her character was known for her catchphrase: ‘How could anyone not like him?’, appearing alongside Barney Martin who played Jerry’s father Morty.As well as her role in Seinfeld, Sheridan is also known for playing Mrs.