perpetrator

[pur-pi-trey-ter]
noun
a person who perpetrates, or commits, an illegal, criminal, or evil act: The perpetrators of this heinous crime must be found and punished to the fullest extent of the law.
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World English Dictionary
perpetrate (ˈpɜːpɪˌtreɪt)
 
vb
(tr) to perform or be responsible for (a deception, crime, etc)
 
[C16: from Latin perpetrāre, from per- (thoroughly) + patrāre to perform, perhaps from pater father, leader in the performance of sacred rites]
 
usage  Perpetrate and perpetuate are sometimes confused: he must answer for the crimes he has perpetrated (not perpetuated); the book helped to perpetuate (not perpetrate) some of the myths surrounding his early life
 
perpe'tration
 
n
 
'perpetrator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

perpetrator
1560s, from L.L. perpetrator, agent noun of perpetrare (see perpetrate). Police slang shortening perp (e.g. perp walk) is Amer.Eng., by 1940s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Identifying the perpetrator of cyber-attacks can be impossible.
The guilty knowledge test focuses its questions on knowledge that only a
  perpetrator would have.
After a number of false leads peter out the perpetrator is discovered when he
  makes a slip.
There is an indication that a police officer may be the perpetrator.
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