mal·e·fac·tor 
(mălə-făk′tər)
(mălə-făk′tər)n.
1. One who has committed a crime; a criminal.
2. A wrongdoer or evildoer.
[Middle English malefactour, from Latin malefactor, from malefacere, to do wrong : male, ill; see mel-3 in the Appendix of Indo-European roots + facere, to do; see dhē- in the Appendix of Indo-European roots.]
mal′e·faction (-făkshən) n.