The Voice of Reason link=topic=93578.msg831122#msg831122
Don't quote me but I read that Jensen, who was a model before getting the role of Athena on the 1979 version of Battlestar Galactica had some substance abuse problems. Anyone who watched that series might have noticed that at the start she had a more substantial role. After the arrival of Anne Lockhart, Jensen was hardly featured.
I went on Wikipedia and read where Jensen had some medical problem, not drugs, which forced her to retire from acting full-time.
As for Lockhart, she married the grandson of Dub Taylor, not the son. Lockhart is currently doing voice-over work.
As for Cheryl Miller, I can't locate, on Wikipedia, what she is doing now. Perhaps, at at 65, she's retired.
A number of actors who appeared on TV shows seem to disappear after a while; many of them young women who can't find work because of their age, or get married and decide to stay at home and raise their children.