Roger H mentioned this; I hadn’t heard about it. Busy character actor William Campbell passed away on April 28th. Mr. Campbell achieved a particularly nerdy sort of immortality by playing two memorable Trek baddies, the juvenile but godlike Trelane, and the Klingon Koloth in the classic Trek episode The Trouble with Tribbles, a role he reprised decades later on an episode of Deep Space Nine. He also worked for Roger Corman, starring in films like Dementia 13, The Secret Invasion and Blood Bath. Perhaps the high point of his career was when he co-starred in his own TV show, 1958’s Cannonball.
Like many such actors, Mr. Campbell eventually slid into a comfortable career of mostly TV guest appearances and B movie work. It’s those Star Trek episodes he’ll always be remembered for, however. Rest in Peace, sir.