From WordNet (r) 2.0 (August 2003) [wn]:
garroter
n : someone who kills by strangling [syn: garrotter,
strangler, throttler, choker]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
garroter \gar*rot"er\, n.
One who seizes a person by the throat from behind, with a
view to strangle and rob him.
[1913 Webster]