Season 6, Episode 25
When Mr. Burns discovers oil being pumped from under the Springfield Elementary school he re-routes it to his own quickly-constructed drilling company for total monopoly on the towns energy supply, taking no prisoners along the way. This upsets just about everybody - including Mr. Smithers, and with the citizens all having justifiable motives Burns ends up taking a bullet. But who pulled the trigger?
Classic episode, one of the most memorable in the series.
See here for Part 2 of this episode.
See here for more details.
Notes & Screenshots: Lord Heath