Simon Morrison

Simon Morrison,known under the alias Adrian Chase, was the former District Attorney of Star City and a former close collaborator/friend of Oliver Queen as mayor, helping him in cleaning up the streets through the legal system. He was the serial killer who was calling himself Prometheus, and not only knew that Oliver Queen is the Green Arrow, but had a personal vendetta against him as well. Having lost his father four years ago at the hands of The Hood, Adrian desired retribution, and spent his time afterwards studying The Hood's skills and history, while also uncovering Oliver's true identity as the Green Arrow. In his alter-ego, Prometheus crusaded against the Green Arrow in order to destroy the hero's life and legacy. He had also been labeled by the media as the "Throwing Star Killer" for murdering people whose names formed anagrams of individuals on the List using shuriken made from Oliver's discarded arrows as a form of sending a twisted message to him.

Eventually, Chase was defeated by Oliver where he was temporarily taken into custody by A.R.G.U.S.. After a short time spent in a glass walled prison, he managed to escape to Lian Yu. After facing off with Oliver in battle once again, he was defeated and then proceeded to die by suicide. His death triggered the detonator which in turn set off all of the hidden bombs situated throughout the island.