Halloween: Resurrection (2002) [Franklin]: Decapitated (off-screen) by Michael (Brad Loree) in the basement. We only hear him screaming over the exterior of the buliding and his severed head is shown in a dryer when Dan Joffre discovers it.
Freddy vs. Jason (2003) [Mr. Mueller]: Decapitated with a machete (off-screen) by Jason (Ken Kirzinger) outside his home. We only see his body sitting on a bench after his son (David Kopp) elbows him to see if he's alive, followed by Brent's head falling off his body as David is waking up from his dream.
Psych: Dead Air (2013) [Crock Daniels]: Shot to death (off-camera) by Ken Kirzinger during a live radio broadcast. We only hear the shots while James Roday, Dule Hill, and Corbin Bernsen are listening to the radio. His body is briefly seen being zipped up in a body bag while police are investigating the scene.