Attended Fagin's School for Drama.
Best remembered by _"Star Trek" (1966)_ (av) fans as the Klingon commander in the iconic "The Trouble with Tribbles" episode.
Bore a strong resemblance to pianist Liberace.
During and following his acting career, he worked with the Motion Picture & Television Fund, and at one point was its administrator chief fundraiser. He died at age 87 in 2011, at the Motion Picture & Television Fund's hospital in Woodland Hills, CA.
Ex-brother-in-law of Susan Morrow and Gary Morton.
Ex-wife Judith Campbell Exner also was a lover of Frank Sinatra's, who introduced her to both President John F. Kennedy and Mafia boss Sam Giancana. Even more, according to the NYTimes, she arranged meetings between the president and the Chicago mob boss.
First wife Judith Campbell Exner professed to be a mistress of President John F. Kennedy. She was also involved with Chicago Mafia boss Sam Giancana during the period she claimed to be Kennedy's mistress.
He is interred at Forest Lawn Memorial Park in the Hollywood Hills.
Older brother of actor Robert Campbell (aka writer R. Wright Campbell).
On the original "Star Trek" (1966) series he played the all-powerful alien Trelane in the episode "The Squire of Gothos" and Koloth, a Klingon, in "The Trouble With Tribbles," both of which aired in 1967. He reprised the role of Trelane for a Star Trek: Judgment Rites (1993) (VG), returned for a 1994 episode of "Star Trek: Deep Space Nine" (1993) and was a regular at Star Trek conventions and cruises.
Served in the Pacific with the Navy during WWII.
Was the first actor ever to sing with Elvis Presley in a motion picture (Love Me Tender (1956)).