1. There is absolutely no doubt as to the individual's guilt. (Video of murder, multiple [5+] witnesses, signed confession/manifesto before the act)
2. Individual is not on the Autism spectrum. (Fully coherent, possible above avg. IQ, just sadistic)
3. Shows no signs of remorse, and was not under the influence of mind-altering drugs during the commission of their crime.
{Now to make it interesting}
4. Their victim was a close friend/family member of yours. (Remember the brutal part of the murder)
5. You alone are tasked with the decision of deciding if they live or face a humane execution. However, if you spare their life, you are responsible for them for the remainder of theirs. ($47.50) per day.
(Now this may seem like a loaded flame-bait question, but I believe this forum is capable of well-thought out answers. (Brimstone, let a few people answer before you tear me apart on this please!

*Note* this is not a moral question. I adhere to the belief that is better that ten guilty men go free, than one innocent man be punished.In criminal law, Blackstone's formulation (also known as Blackstone's ratio or the Blackstone ratio) is the principle that:
"It is better that ten guilty persons escape than that one innocent suffer",
...as expressed by the English jurist William Blackstone in his seminal work, Commentaries on the Laws of England, published in the 1760s.
This is a practical application question. How should we as a society deal with such an individual, and would you accept the burden of determining their fate?