Yes, it was regarding the young man who Williams shot after robbing the store in which he worked. His mother is the one quoted in the AP article.
If so, when and to whom was the statement made?
The statement was made to a fellow inmate who subsequently testified to it. I don't recall when it was made.
Whether or not many people actually write any of their own books is arguable at best. Your point?
I thought that was obvious. One of the reasons Williams' supporters gave for clemency was his authorship of the children's books. It is arguable (some say doubtful) that Williams wrote them or even really had a lot to do with them. There is evidence to suggest that the books were a prison-yard scam designed to gain sympathy for his case.
...I do find it quite contradictory that someone can be 100% 'pro-life' and 'pro-death penalty.'
I'm not sure if you are referring to me, but I have never indicated that I am 100% pro-death penalty. If I sat on a jury, the only way I could hand out the death penalty was to be sure that the perpetrator would never again be able to harm another person. The irony of capital punishment is that it has become ever more necessary as our judicial and prison systems have become revolving doors. The liberalism of the 1960's has left us in a situation in which it is necessary to kill these people just to defend ourselves. If we operated a punishment system in which "life in prison" actually meant something, I expect a reasonable argument against capital punishment could be made. Unfortunately, we now find ourselves living with a system in which degenerates are not punished but instead adopted as mascots by the liberal elite.