An Enterprise-D ensign at the conn who is killed on the bridge by the entity Nagilum as a demonstration of death in Where Silence Has Lease.
Ensign Haskell is a flight control officer aboard the Enterprise-D in 2365. He appears in the second-season episode Where Silence Has Lease.
He is at the helm when the ship is swallowed by a featureless void and finds that every course he sets brings it straight back to the same beacon. The void turns out to be the laboratory of Nagilum, a curious being who has never met creatures with such limited lives.
Wanting to understand death, Nagilum simply causes Haskell to convulse and die at his station in front of the bridge crew. It then announces that it will need to use up a third to a half of the crew to study the matter fully, which drives Picard to set the auto-destruct rather than submit.