doomsman

noun2

1. •
   (rare) One who carries out a judgement or sentencing; executioner.

   • At the place of execution, Dorothea begged the doomsman to tarry a little, and kneeling by the block, she raised her hands to heaven and prayed earnestly. — 1907
2. •
   (no longer used, historical) One who renders judgement (e.g. a judge, magistrate, or arbiter); an umpire.

   • The fire shall burn about the Doomsman. — 1865