Final answer:
In "Threat Level Midnight" from The Office, Michael Scarn's late wife is named Catherine Zeta-Scarn, and she was killed by the character Goldenface.
Step-by-step explanation:
In the The Office Season 7, Episode 16 titled "Threat Level Midnight," the character Michael Scarn, who is played by the character Michael Scott, is shown to have a late wife. Her name is Catherine Zeta-Scarn. The film "Threat Level Midnight" is a movie within the show, written and directed by the series' character Michael Scott. Catherine Zeta-Scarn, as indicated within the movie's universe, was killed by the show's villain Goldenface, who is played by Jim Halpert in Michael Scott's action movie script.