What has the author Delos E Toole written?

You're likely thinking of "A Confederacy of Dunces", a satirical novel published in 1980.

It's important to note that the author, John Kennedy Toole, died by suicide in 1969. The novel was posthumously published thanks to the efforts of his mother, who advocated for its release.

So, while Delos E Toole isn't the correct name, it's understandable that you might mix them up!