Source : Webster's Revised Unabridged Dictionary (1913)

Malefactor \Mal`e*fac"tor\, n. [L., fr. malefacere to do evil;
   male ill, evil + facere to do. See {Malice}, and {Fact}.]
   1. An evil doer; one who commits a crime; one subject to
      public prosecution and punishment; a criminal.

   2. One who does wrong by injuring another, although not a
      criminal. [Obs.] --H. Brooke. Fuller.

   Syn: Evil doer; criminal; culprit; felon; convict.

Source : WordNet®

malefactor
     n : someone who has committed (or been legally convicted of) a
         crime [syn: {criminal}, {felon}, {crook}, {outlaw}]