Even BSH needs some help every now and then. After all, there are only so many agents. To fill this gap, human police, army, and other similar lines of work are used as BSH Cops. They are the best of the best and help catch the worst of the worst.
One officer, David Mitchell was one of these special people. He was originally a cop, but soon was promoted to BSH. He was a good officer, helping bring in many bad guys. This all changed, however with tragedy.
His wife Sarah was on her way home from work when she was caught in the middle of a firefight between Shockwave, a villain and Beatdown, a hero. Beatdown was not a very good hero and in fact, it was his actions which caused the death of David’s beloved Sarah.
After this, something within David just broke. The people he had been working with for years had just killed his wife, it was something he couldn’t take. David became insane, realizing that heroes were equal, if not even more of a threat to the populace than any villain was. They put on facades of heroism, but were just the same as the scum he had helped put away. If noone else was going to stop them, then he would have to do it. He gathered his weapons and a mask and became Massacre.
Massacre has claimed the lives of dozens of heroes, each with their mask stripped away. He is the most deadly of the Super-serial killers and the one who has eluded BSH the most.