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By definition, a serial killer is someone who kills people frequently following a pattern. Often this pattern, this repetition of the killer's killings, is an act of vanity, a symbol of their identity, a signature. Experts define a serial killer as a severely disturbed and cruelly inhumane person, and you'll find out why. 3 Most Vicious Serial Killers in History - BASED ON REAL FACTS Impact Allegretto by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...) Source: http://incompetech.com/music/royalty-... Artist: http://incompetech.com/ Black Vortex - Scoring Action by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...) Source: http://incompetech.com/music/royalty-... Artist: http://incompetech.com/