The Collaborative International Dictionary of English v.0.48:

Throttler \Throt"tler\, n.
   1. One who, or that which, throttles, or chokes.
      [1913 Webster]

   2. (Zool.) See Flasher, 3
      (b) . [Prov. Eng.]
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wariangle \War`i*an"gle\, n. [OE. wariangel, weryangle; cf. AS.
   wearg outlaw, criminal, OHG, warg, warch, Goth. wargs (in
   comp.), G. w["u]rgengel, i. e., destroying angel, destroyer,
   killer, and E. worry.] (Zool.)
   The red-backed shrike (Lanius collurio); -- called also
   w["u]rger, worrier, and throttler. [Written also
   warriangle, weirangle, etc.] [Obs. or Prov. Eng.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

throttler
    n 1: someone who kills by strangling [syn: garroter,
         garrotter, strangler, throttler, choker]