I asked Greenberg if there had ever been a Dr. Phil show devoted solely to a perpetrator of a crime.
Kilcoyne said the department has to show that the perpetrator is an “ongoing threat to the public.”
Pickton is the perpetrator of one of the most gruesome killing sprees ever to grip North America.
literally "the one who did it" (in English usually an evil act), 1560s, from Late Latin perpetrator, agent noun of perpetrare "to perform, to accomplish" (see perpetrate). Fem. forms are perpetratress (1811, of Nero's poisoner Locusta); perpetratrix (1862, in reference to Charlotte Corday).