Could you cite a single example in which a combination of all types of evidence has resulted in a death sentence being pronounced upon an innocent person? That would require a massive conspiracy to frame an innocent person including either a coerced or voluntary confession. Not saying that is impossible these days, but it seens highly unlikely considering the number of appeals, amicus briefs, innocence projects, etc. that would scrutinize every aspect of the case.
I'm not married to the death penalty due to its finality and inabity to undo any actual miscarriages of justice.
At the same time, I make a distinction between the truly innocent and the "wrongfully convicted." I'm sure that rights have been violated, inadequate representation provided, or gross violations of legal proceedings to tbe point that convictions should be overturned. That still does mean that the suspect didn't commit the crime.
O.J. Simpson was found to be "not guilty," but I'm not sure that a majority considers him to "innocent" of murder charges.