Warm up Old Sparky and fry the maggots.
Whatever works with speed and precision represents society well.
Whatever is an unnecessary and half assed issue of the death penalty is as bad as the crime itself, and represents only the ghoulish satisfaction of those whom are, thankfully, but a tiny rather depraved minority among the civilized.
Firing squad, hanging, and generally even Old Sparky have a more merciful record in application than these new, shiny pharmaceutical methods that have become a punch line for failure.