Source : Webster's Revised Unabridged Dictionary (1913)

Captor \Cap"tor\, n. [L., a cather (of animals), fr. caper to
   take.]
   One who captures any person or thing, as a prisoner or a
   prize.

Source : WordNet®

captor
     n : a person who captures and holds people or animals [syn: {capturer}]
         [ant: {liberator}]