深藏不露 Office Killer (1997)

A mousy office worker accidentally kills one of her coworkers, then proceeds to bump off a few others.An office worker named Dorine is called upon to do late work; her computer breaks down and she asks the help of a co-worker, Gary Michaels, who is electrocuted while trying to fix the wires. Dorine dials 911, but hangs up when the call is answered. She places the corpse on a cart, rolls it down to her car, loads it in her trunk...