This is a particularly tragic example of an apparently innocent person being executed, of a miscarriage of the judicial process, including but not limited to executing someone who is not able to participate fully or effectively in his own defense. We should never be executing children in this country for that reason, or anyone who is impaired from being able to participate as a competent adult.
Beyond that consideration, this appears to be yet another example of racism and the death penalty that should concern all of us who wish to have an honest and fair legal system. So long as we do not, the death penalty should be off the table.
Sadly, as has been observed elsewhere, many times, those who support the death penalty are routinely not well informed on the subject but rather take an uniformed and emotional position.