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Derek McGrath was on several episodes of Dallas on and off. He played Oswald Valentine, the man who started a lingerie company that Sue Ellen Ewing bought out.
He also played "Crewman Chell" in two episodes of Star Trek Voyager, from Seasons 1 & 7 (Learning Curve & Repression, respectively).
Here's a more recent picture of him from the TV series he did in 2001, called "Doc".