Mark Gunther

Mark Gunther was a human male in the twenty-fourth century. He was the son of Abraham Gunther, a psychologist and former Starfleet officer. He followed his father into the service, rising to the rank of Lieutenant. His first starship post was as weapons officer on the USS Constitution. Unfortunately he died on February 10 2381 when the Constitution failed to defend Deneva against the Borg invasion of the Federation. Gunther, his ship, its fleet and the planet were all lost. (DS9 novel: Force and Motion)