From Dave's Long Box:

"The Writer" first appeared in the now famous Animal Man #26 (DC Comics, 1990) , written by Grant Morrison. At the end of his brilliant head-trip of a run on Animal Man, Morrison broke the fourth wall big time by introducing himself in the comic itself to Animal Man as his writer, his creator and ultimate adversary. It was a very well done issue with a surprising emotional resonance that transcended what could have just been a cheap Twilight Zoney storytelling gimmick.

Ostrander and Yale figured, hell, if Morrison appeared in an issue of Animal Man, then he's part of mainstream DC continuity, right? Fair game, right? In Animal Man #26, artist Chas Truog depicted Morrison / The Writer as a ghostly pale British mod, and Squad artist Geoff Isherwood follows form, although here The Writer is dressed in more practical field attire.

So naturally, Ostrander and Yale kill Morrison. But he didn't stay dead.