The link that you posted shows “86 wrongful convictions” of persons
who WERE on death row and later evidence determined they were
not guilty, but in most cases, kept them in prison on lesser charges.
It does NOT show anyone who was executed and then later found to be innocent.
It is also unclear what time period is covered for those cases.
I spent about twenty minutes searching for any details about anyone
who had been executed and later found to be “not guilty”.
I found two possible cases, one of them was from the 1800s.
I’m not calling you out on this,
but I seriously can not find any documentation of it.
Here’s a recent case where the man was executed based on arson evidence that now looks suspicious:
http://camerontoddwillingham.com/
Wiki has a page dedicated to the topic:
http://en.wikipedia.org/wiki/Wrongful_execution