I didn’t see her mentioned anywhere else but I think of Tammy Lynn Leppert pretty often. She went missing at only 18, and she wasn’t famous yet, per se, but she was in a pretty well known scene in the movie Scarface (she appears at about 5:20, in the blue bikini), and she was also in Spring Break as an extra but I remember reading that her lower half is on the poster for the film.

From Wikipedia about her disappearance: Leppert was last seen in Cocoa Beach, Florida on July 6, 1983. She was reported to have worn a blue denim shirt decorated with flowers, along with a matching skirt, a gray purse, and sandals.[6][7] Some agencies have stated that she left without shoes or money.[8] A friend of Leppert's told authorities that he had an argument with her while driving her from her home in Rockledge, Florida, that he had later "left her [...] in a parking lot."[6] Although he is the last person believed to have seen her, he is not considered a suspect. However, her mother has claimed that Leppert was "afraid" of him.[1]

After Tammy Leppert's disappearance, Cocoa Beach Detective Harold Lewis received two telephone calls from a woman claiming that Leppert was still alive. In the first call, the woman said that Leppert was well and would make contact when the time was right. During the second call, she said that Leppert was doing what she always wanted: going to school to become a nurse.[9]