Kristy has not been married yet and her sexuality was a matter of secret till 2012. That year she announced that she is lesbian. She also revealed that she dated Elisabeth Brooks for about a year in 1980. Elisabeth Brooks was a Canadian actress.
From 1991, Kristy has been dating Martie Allen. Martie Allen is a normal woman and they have been in this love for about two and half decades. Both of them revealed that they are lesbian and they have been seeing each other since the early 1990s. Her nationality is American and she is of white ethnicity.
Kristy's elder brother Jimmy McNichol is also an actor. At a young age, she began appearing in TV commercials and ads with her brother. In 1973, she made her acting debut by starring the role of Steffi in a comedic television anthology Love, American Style. The following year, she began appearing in a television comedy-drama series Apple's Way playing the role of Patricia Apple. She got her rise in fame in the mid 1970s after she began portraying the role of Letitia "Buddy" Lawrence in an American television drama series Family. In 1977, she was seen in an American thriller movie Black Sunday. In the late 1970s, she appeared in several movies like The End, Like Mom, Like Me, Summer of My German Soldier and My Old Man. After being active in acting for about three decades, she finally announced her retirement from acting in 2001 and since then she has been teaching acting at a private school in Los Angeles. Her net worth is $7 Million.