It's the nightmare of capital punishment, for supporters and opponents alike - an innocent person condemned to death and executed.
As Californians prepare to vote in November on Proposition 34, which would reduce all death sentences to life in prison without parole, both sides on the issue agree that the state has never executed a prisoner who was later proved to be innocent.
Still, doubts persist about the guilt of an inmate who was put to death in 1998. And five men sentenced to death under current California law were later cleared of the murder charges that put them on Death Row.
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