Fished writes "In the debate on the modern death penalty, proof that an innocent man has actually been executed in modern times has become a grisly milestone--proof that even with all the modern safeguards, the death penalty is still fundamentally flawed. In the words of Sandra Day O'Connor, 'execution of a legally and factually innocent person would be a constitutionally intolerable event.' Regrettably, as detailed in this article from the New Yorker, which includes fascinating details on the science fire investigation, that milestone appears to have been met. On February 17, 2004, Cameron Todd Willingham was executed for a fire that killed his 3 daughters, a fire that was not, after all, arson. May he rest in piece."
Link to Original Source