Edna didn't die in any specific episode. The Simpsons were oddly indirect about addressing Marcia Wallace's & therefore Edna's death until Season 25's The Man Who Grew Too Much. They were a little more direct when they showed Ned wearing a black armband with a photo of Edna (& Maude) saying to Nelson, "I sure do miss her laugh".
It was in later seasons that they finally showed Edna has a ghost.
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Excluding the Halloween episodes, Martin is presumed dead in Dial N for Nerder
The Simpsons creator Matt Groening is 63 years old (birthdate: February 15, 1954).
Episode 280 i think....
End of the Episode 166
series 3, episode 16