This article is from the The Simpsons FAQ, by Ondre Lombard wakkojr@nospam.wcat.com and Andrew Gill superluser@mail.rit.edu with numerous contributions by others.
He died before Who Shot Mr. Burns, Part 2. In that episode, there is a
Marvin Monroe Memorial Hospital. (Memorials are only given
posthumously) The staff supposedly hated him, so they wrote him out.
 
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