killeress

plural killeresses

1. a female killer

   To begin with, was the Borden double-killer a killer or a killeress — a hatchet-man or a hatchet-woman?

   1944, The University Review

   2 more examples

   Get out of the way of the killeress." And she, worse than ever leper before, was in solitude in the midst of life. She lived anyhow, slept anywhere, and was never greeted by sign or voice.

   1869, Le Mesurier Hunt, Peeps at Brittany: The Bretons, and Breton Literature, page 116

   “It turned up callously at the Lyceum last evening with Richard Barthelmess as the snide killer and Mary Phillips as the killeress." he wrote.

   2007, David W. Menefee, The First Male Stars: Men of the Silent Era, BearManor Media, page 1888