Actress Shirley Mitchell, the last surviving adult cast member of beloved U.S. comedy series I Love Lucy, has died at the age of 94. Mitchell, who played leading lady Lucille Ball's friend Marion Strong on the show, passed away on Monday (11Nov13) from heart failure in Los Angeles, California. The actress joined I Love Lucy in 1953 and appeared in three episodes. Her other TV credits include Petticoat Junction, The Beverly Hillbillies, Perry Mason and The Red Skelton Hour. She also made a few big screen appearances in films like Big Business and The War of the Roses. Mitchell was the widow of composer and lyricist Jay Livingston, who helped pen Doris Day's Que Sera Sera. He passed away in 2001. She is survived by their two children Scott and Brooke.