Karen Montgomery who starred in a Star Trek spin-off show has died aged 66.

The actress died on Friday in Los Angeles after a nearly decade-long fight against breast cancer, according to an article on Tuesday by Variety.

Montgomery portrayed Princess Beata in a 1988 season one episode of Star Trek: The Next Generation.

Actress and producer: Karen Montgomery, shown in 2011 in Los Angeles, died on Friday aged 66 after a long battle with breast cancer

She also worked behind the scenes in Hollywood and was an assistant to screenwriter Waldo Salt, director Hal Ashby and producer Bruce Gilbert in the 1978 drama Coming Home.

The film earned nine Oscar nominations and won three for Best Actor [Jon Voight], Best Actress [Jane Fonda] and Best Original Screenplay.

Montgomery also had producing credits for the 1994 movie Row Your Boat, 1997's 'Til There Was You and the 1991 drama Diary Of A Hitman.

Season one: The actress portrayed the leader of a female dominated planet in a 1988 episode of Star Trek: The Next Generation

Federation intervention: Commander William Riker, played by Jonathan Frakes, wore traditional Angel I clothing while intermingling on the female-dominated planet

Diary Of A Hitman starring Forest Whitaker, Sherilyn Fenn and Sharon Stone was directed by Montgomery's former acting coach Roy London.

Montgomery and her director husband Christopher Monger, 65, following London's death from AIDS complications in 1993 produced the documentary Special Thanks To Roy London.

The documentary premiered in 2005 at Tribeca Film Festival in New York City.

Husband and wife: Christopher Monger is shown with Montgomery in 2011 in Hollywood at the Writers Guild Awards

Montgomery started acting in the 1970s and her TV credits included a 1978 episode of Kojak, Nero Wolfe in 1981 and L.A. Law in 1993.

She played the leader of the female-dominated planet Angel I in the Star Trek: The Next Generation episode.

Montgomery is survived by her husband; her mother Susan Nelson and brother Carl Montgomery.