Tremble crime

Nathaniel Barnes is a former marine, and the former captain of the Gotham City Police Department. Taking on the role from former captain then Commissioner Sarah Essen after her death at the hands of Jerome Valeska. A strict by the book law enforcer until he became infected with the effects of the Tetch blood virus he went insane and gained anger-induced superhuman abilities, he took on the role of The Executioner, to murder guilty criminals against the law but was brought down with the efforts of James Gordon and sent to Arkham Asylum.