Even for those of us who in theory support the death penalty for heinous crimes, Tuesday’s scheduled execution of Marcellus Williams is a travesty. Williams is almost certainly innocent, and the Supreme Court should block the execution.

I knew nothing about this case until columnist Peter Savodnik published a piece about it this morning. After following the internal links to the original court documents, however, one finds mind-boggling evidence not just casting doubt on Williams’s guilt but almost completely proving his innocence. The conscience reels at the thought that he could be executed at 6 p.m. Central time.