'Star Trek' actor Gary Graham dead at 73

Actor Gary Graham, best known for his roles in "Star Trek: Enterprise" and "Alien Nation," has passed away.

His wife of nearly 25 years, Becky Graham, told Fox News Digital that the actor died from cardiac arrest on Monday in a Spokane, Washington, hospital. He had a history of heart problems, but Graham says her husband's two-day intensive care stay came on suddenly. He was 73 years old.

"I always say he was my knight in shining armor, and I was his port in the storm," Becky said.

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Gary Graham, who starred in multiple offshoots of "Star Trek," passed away from cardiac arrest. (Albert L. Ortega/Getty Images)

"He was loved by many," she added of her husband. 

Graham's most recurring role in the "Star Trek" franchise was as Ambassador Soval in the television series "Star Trek: Enterprise." He appeared on the show from 2001 to 2005. He was Tanis in an episode of "Star Trek: Voyager" in 1995 and Ragnar in two projects, "Star Trek: Of Gods and Men" and "Star Trek: Renegades."

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Actor Gary Graham passed away at age 73. (Gabe Ginsberg/Getty Images)

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Graham also starred as Detective Matthew Sikes in Fox's "Alien Nation" in 1989, a series adapted from an earlier film that starred James Caan and Mandy Patinkin. The show was canceled after one season.

He played the character again in several "Alien Nation" TV movies.

Gary Grahm starred alongside Terri Treas and Eric Pierpoint in "Alien Nation." (20thCentFox/Courtesy Everett Collection)

Graham also starred in the 1989 film "Robot Jox" and the television show "JAG."

Born in Long Beach, California, Graham was a resident of Washington state at the time of his death. In addition to his wife, Graham is survived by his daughter, Haley, and sisters Jeannine and Colleen.