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...The very first instance of that line? It's pretty stock, I doubt it would be even possible to determine. That said, since you asked, the only example that comes directly to mind in The Simpsons episode "Homie the Clown".
Yeah, I recognise it from The Simpsons, but I was wondering if the same line with a similar intonation exists anywhere else in film or TV.
Asked in 2006 with no real answer.. http://ask.metafilter.com/51503/Did-someone-else-die-first
I think this line has turned up in various older films and action-adventure films. For instance, a character getting infected with a plague or stuck in a high radiation zone, or on the run from authorities without medicine to help heal him...
These examples'would all mean "he might as well be dead for the time he has" rather than, "hey, look, here's an aleady dead person!" Hope this helps n
The 1950 movie DOA had it as its main plot point: https://tvtropes.org/pmwiki/pmwiki.php/Film/DOA
What show originally had the line "He's already dead!"?