An ensign serving at operations aboard the USS Shenzhou who dies in the Battle of the Binary Stars in 2256, and whose mirror universe counterpart captains the ISS Shenzhou.
Danby Connor is played by Sam Vartholomeos in the first season of Star Trek: Discovery. He appears on Captain Georgiou's bridge in The Vulcan Hello and Battle at the Binary Stars. Injured and concussed when the Klingons open fire, he wanders dazed into the brig, where Michael Burnham is confined.
He asks her why they are fighting when Starfleet is meant to explore, and is killed seconds later when a hit tears open the hull and blows him into space.
In Despite Yourself the Discovery crew learn that the mirror Connor took command of the ISS Shenzhou after its captain, the mirror Burnham, was presumed dead. When Burnham poses as her counterpart he tries to murder her in a turbolift to keep his chair, and she kills him.