When a character is permanently written out of a show, especially killed off, in a way that is unexpectedly anti-climactic or mundane, they Dropped a Bridge on Him.
This can be a case of Writer on Board (or worse, Running the Asylum), but may also be an attempt to make the best of a difficult, real life situation.
Sometimes, when a character is Killed Off for Real in a universe where Death Is [...] [tvtropes.org]