Source : Webster's Revised Unabridged Dictionary (1913)

Throttler \Throt"tler\, n.
   1. One who, or that which, throttles, or chokes.

   2. (Zo["o]l.) See {Flasher}, 3
      (b) . [Prov. Eng.]

Source : WordNet®

throttler
     n : someone who kills by strangling [syn: {garroter}, {garrotter},
          {strangler}, {choker}]