A somewhat baroque means of murder, the killer shuts their victim in a coffin (knocking them out first is optional) and feeds the coffin into a crematorium oven. This both kills the victim and disposes of the body in one fell swoop. Occasionally the killer will opt to dispense with the coffin. Note that in Real Life this wouldn't entirely work for the disposing of the body part, since cremation alone is insufficient for fully destroying the bones of the body (this being done later by placing them in a special grinding machine). Useless trivia: a crematory oven is called a "retort".