The system worked
As well as it can work. His appeals will go nowhere and he will surely fry in the end. So much for human garbage.
A Better system of capital punishment existed under the Taliban where the relatives of the victim had the privilige of performing the execution.
Personally, I prefer the punishment of irrevocable life imprisonment in solitary confinement over legalized murder by the state until the victim's family is allowed to choose the method of death and is required to execute the sentence.