Frank Darwin

From Memory Alpha, the free Star Trek reference.

Frank Darwin was a crewman aboard the USS Voyager. He was recommended for the officer program by his training instructor, but instead he chose to serve aboard Voyager as an engineer. He left behind three sisters on Earth.

Darwin was murdered in 2372 by a Betazoid named Lon Suder, a former member of the Maquis. Suder had no real motive in killing Darwin, a fact that investigator Tuvok found difficult to accept. (VOY: "Meld")

The corpse of Darwin was played by an unknown actor.