@Karlos:
In both cases the person is dead and found innocent afterwards. Granted it's less likely in the life imprisonment case
Yet you still appear to favour the death penalty? Strikes me as a little illogical.
I'm sure we're all agreed that no system is perfect but you seem to be justifying the worst method by merely stating the other isn't a "much" better option. Sort of a "Hey, (s)he'll probably die in gaol anyway, so we might as well hang/behead/gas/electrocute/etc, him/her now."
If there is a false conviction, you say yourself there's more chance of partially rectifying it with the prison sentence.
Surely we should be striving towards the best option available?
Furthermore, a prisoner can still have a life of sorts. They can usually read, excercise, play musical instruments, etc.
In both cases the person is dead and found innocent afterwards.
So, whilst the above statement is true, you can surely agree that there's a bit more to it than that? If I'd been wrongly convicted, I'd far rather a life sentence, where I can hope for justice to eventually prevail, whilst still trying to have some sort of existence, than be murdered by the state, only for them to later say, "Oops!"