Ruth Cohen, who appeared more episodes of “Seinfeld” than anyone except the main stars, died Aug. 23 of a heart attack in Panaorma City, Calif. She was 78.

Her character on “Seinfeld,” the cashier at the Monk’s Café, was known by her real name, Ruthie Cohen, and appeared in nearly every episode of the long-running series.

Born in the Bronx, Cohen began acting in the 1980s after raising two children, starting as an extra for shows including “Murder She Wrote” and “Golden Girls.”

A memorial service will be held Thursday, Aug. 28 at 11:00 a.m. at Mount Sinai Hollywood Hills.

She is survived by a son, a daughter and two grandchildren.