Doesn’t matter to a guy that is serving life already. All he needs to do is make it look as though it wasn’t premeditated, and all he’ll get is another life term, at most. In the meantime, his family and “family” (gang) get the money.
Not so simple. The guy doing life will do pretty much anything to keep what few privileges he has. Bad guys in that predicament are pretty quick to deal, and turn on those who hired them to keep from being shipped to a super-max or otherwise more miserable prison. Then what is the guy who hired him gonna do? Ask his family for the money back? Get real. Face facts, a guy so lacking in morals that he’ll kill for money is going to be quick to turn on you if it likewise benefits him in any way.