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Re:When the cops subpoena your Facebook information, here's ... by greenyoda on Saturday April 07, 2012 @06:42PM (#3812369)
The Innocence Project reports that they've exonerated (via DNA evidence) 17 people who had already been sentenced to death and were awaiting execution:

http://www.innocenceproject.org/know

This strongly suggests that many other innocent people are still on death row or have already been executed, since the Innocence Project doesn't have the resources to investigate all cases of claimed innocence, and has to limit its efforts to saving people who are still alive.

The Wikipedia article on wrongful execution claims that "at least 39 executions are claimed to have been carried out in the U.S. in the face of evidence of innocence or serious doubt about guilt."

https://en.wikipedia.org/wiki/Wrongful_execution

Re:When the cops subpoena your Facebook information, here's ... by twoodfin on Saturday April 07, 2012 @10:31PM (#3812817)
So pick the most convincing one that was actually executed. For such a charged issue, it's hard to take passive voice claims on Wikipedia too seriously.

Felker and Garrett are the only "specific examples" in that article from the US in the past few decades. Garrett sounds plausibly innocent, but there's certainly no posthumous proof. Similarly, Felker's alibi depends on autopsy results from a body found in a creek. Not really a slam dunk either.

Many anti-death penalty advocates believe (wrongly, I think) that it would be a huge boon to their cause if they could identify someone who was clearly innocent of the crime for which they were executed. oskarth apparently believes instances have already been found. I'm just looking for the current exemplar.