Brimstone (1998)

S1E6 Executioner

A tormented soul is targeting those he believes have evaded justice, taking them out with deadly electrocution and leaving no trace behind. Initially, suspicion falls on Lambert as the potential killer, but it’s soon revealed that Willy the Janitor is the real vigilante behind these gruesome acts. In the climax, Stone ultimately ensures Willy’s fate is sealed, sending him back to Hell for good.