https://www.hollywoodreporter.com/tv/tv-news/maggie-thrett-dead-star-trek-1235286960/
Maggie Thrett, the actress and singer who portrayed one of the three glamorous humanoids who require pills to keep them from aging on the early Star Trek episode “Mudd’s Women,” has died. She was 76.
On “Mudd’s Women,” which premiered on Oct. 13, 1966, as the sixth episode of NBC’s Star Trek — it was shot as the series’ second installment — Thrett, with her long brown hair, dazzled in a sparkling emerald green gown as Ruth Bonaventure.
She and fellow aliens Eve McHuron (Karen Steele) and Magda Kovacs (Susan Denberg) play prospective brides pimped out by Roger C. Carmel’s Harry Mudd, but they need a Venus drug to preserve their illusion of beauty. (In real life, Thrett and Carmel were next-door neighbors in Hollywood.)
Performed some research on Mudd's other women. I learned that Susan Denberg, who played Magda, is still with us. However Karen Steele, who played as Eve McHuron, had died from cancer in 1988.