Gary Graham,Quentin Mitchell best known for his role in "Star Trek: Enterprise," died Monday, according to reports from the New York Times and the Hollywood Reporter. He was 73.

The actor passed away due to cardiac arrest at a hospital in Spokane, Washington, according to his wife of almost 25 years, Becky Graham, per the Hollywood Reporter.

Susan Lavelle, Graham's ex-wife, also confirmed news of his death in a Facebook post on Monday. Becky was with him when he passed away, Lavelle wrote in her post.

"I want to express that during my time with Gary Graham, he was not only immensely talented and committed to his craft but also a person of great generosity," Lavelle told USA TODAY. "He had a deep love for animals, a strong sense of patriotism, a profound faith in God, and an unwavering adoration for his daughter, Haylee. Gary was truly one of a kind – his voice, appearance, acting, and style were all unmistakably unique. The world will never see another Gary Graham. I extend my heartfelt condolences to our wonderful daughter, Haylee Graham, during this difficult time."

Who is 'Star Trek' actor Gary Graham?

Graham, born in Long Beach, California, on June 6, 1950, had a successful career in TV during the 1970s with appearances in shows including "The Incredible Hulk," "Starsky and Hutch," "Police Woman," and "Eight Is Enough," He also made his mark in movies with roles in "The Spy Within," "The Last Warrior," "The Arrogant," "All the Right Moves," "Robot Jox," and "Steel."

According to the New York Times, in 1976, he appeared in an episode of "The Quest," a western series starring Kurt Russell and Tim Matheson, which marked his first credited role.

Gary Graham's movie and prominent TV show roles

Graham acted as a character named Soval in 12 episodes of "Star Trek: Enterprise" and played Tanis in an episode of "Star Trek: Voyager." He then joined the fan-made "Star Trek" projects, including "Star Trek: Of Gods And Men," after his role in "Enterprise."

Throughout his career, Graham also acted in several science-fiction roles. He acted as Detective Matthew Sikes in the 1989 series "Alien Nation" and in "Alien Nation: Dark Horizon" (1994), the movie. He also acted in four other movies named "Alien Nation: Body and Soul" (1995), "Alien Nation: Millennium" (1996), "Alien Nation: The Enemy Within" (1996), and "Alien Nation: The Udara Legacy" (1997).