garroter

noun

1. A person who uses a garrote.
2. A person who strangles someone from behind.

   “The digestion of evil aroused in him an appetite for worse. It was the street boy turned pickpocket, and a pickpocket turned garroter.”

   ““Because I recognized their sentinel when I glanced out of my window. He is a harmless enough fellow, Parker by name, a garroter by trade, and a remarkable performer upon the jew’s-harp.”