Executioner

Symbolic robed figure of a medieval public executioner at Peter and Paul Fortress, Saint Petersburg, Russia
Photograph (hand-coloured), original dated 1898, of the lord high executioner of the former princely state of Rewah, Central India, with large executioner's sword (Tegha sword)
Depiction of a public execution in Brueghel's The Triumph of Death 1562–1563
Stylised depiction of public execution of pirates in Hamburg, Germany, 10 September 1573

An executioner, also known as a hangman or headsman, is an official who effects a sentence of capital punishment on a condemned person.