I don't know that it matters much for him. If someone pays you to kill someone and you then manage to not kill the guy, get caught, and your arrest leads back to the source (as it seems to, with so many people arrested) you're probably on borrowed time no matter whether you're found guilty or not and regardless of what sentence you get.
more than likely, the first guy ratted out the others to save his skin (what's left of it). Don't know much about Dominican due process.
