You re-examine the evidence and ABSOLUTELY prove executed guy #456 didn't do the crime.
The libs have been looking for this guy for decades. they haven't found him yet.
They've gotten a few obviously guilty guys off on technicalities, so I guess that's something to be proud of.
I don't see why the standard for avoiding the death penalty should be "absolutely didn't do it," but I'll bite.
Here's just one example. It's from the UK, but I think it's poignant because it helped turn public opinion against the death penalty over there.
Remember, you said I only needed one.
"Timothy Evans in the United Kingdom, was tried and executed in 1950 for the murder of his baby daughter Geraldine. An official inquiry conducted 16 years later determined that it was Evans's fellow tenant, serial killer John Reginald Halliday Christie, who was responsible for the murder. Christie also admitted to the murder of Evans's wife as well as five other women and his own wife. Christie may have murderded other women, judging by evidence found in his possession at the time of his arrest, but it was never pursued by the police. Evans was pardoned posthumously following this, in 1966. The case prompted the abolition of capital punishment in the UK in 1965."