Shirley Mitchell, best known for her guest-starring role on the hit sitcom “I Love Lucy,” has died at the age of 94, reports The Hollywood Reporter.

The comedic actress played Marion Strong, Lucy Ricardo’s friend with the outrageous laugh, on three episodes of the show’s third season. She is believed to be the last surviving adult cast member of the series.

Shirley’s sister-in-law, actress Nancy Olson, confirmed to the mag that she passed on Nov. 11 from heart failure at her home in Westwood, CA. Shirley was the widow of pop composer Jay Livingston who collaborated on a few Academy Award-winning songs including Doris Day’s “Que Sera Sera.” The couple was married from 1992 until his death in 2001.

Shirley appeared in a number of different television shows throughout the 50s and 60s, her most notable guest-appearances being Kitty Deveraux on “Bachelor Father,” Mae Belle Jennings on “Petticoat Junction” and Opal Clampett on “The Beverly Hillbillies.”

She is survived by her two children, Brooke and Scott.