All right here goes...
First of all i would torture you with one of the many techniques I have thought of, which is to shoot out your shins, wait until your hospitalization and recovery ends, then shoot out your shins again, and repeat until you are heavily in debt or until you can no longer repair you legs. After this process I would spread rumors to ruin your career( so that you are unable to feed your family, own a house, or pay off those debts I have just given you from your years of hospitalization) Then I would follow you around for the next few years, making sure that no spark of happiness ever entered your life (killing off your relationships, infecting you with some painful virus every other week, and alerting the loan sharks you have been borrowing from to pay off your debts of your location constantly, leading them to abuse you and beat you repeatedly.) After I deemed your suffering to be adequate, I would kidnap you, use a cheese grater to slowly skin you alive, using a constant supply of smelling salts to make sure you don't pass out from pain or shock, then cauterize all of the cuts by lowering you at a speed of 1cm/min into a vat of boiling citric acid. Now, if you have somehow managed to survive this process, I will proceed to hang you by your arms to the ceiling, and systematically eliminate each and every one of your family members, and showcase their heads in a location unable to be avoided by your eyes(which are constantly open because I cut off your eyelids, but keep them usable with hourly applications of eye drops).After this I would most likely just let you starve to death.
Just one of the scenarios I have concocted in my contemplations of the worst possible way to kill someone.