Supervixens is a 1975 sexploitation film by American filmmaker Russ Meyer. The cast features Meyer regulars Charles Napier, Uschi Digard, and Haji. The film also features Shari Eubank (in a dual role) in one of her only two film roles ever and Christy Hartburg in her only film role ever.
Christy Hartburg died in 1975.
We know that Hartburg was alive in 1975 and stopped acting after that, but we don't know why, or when she died. I beat it by using much of the original language in the statement. 