5 Terrifying Serial Killer Signatures

The personal stamp in serial killer signatures left at their crime scenes or in the method of their kills can be as frightening as the crimes themselves. 

Creepiest fictional serial killers, Sno-Isle Libraries

CRIME HUNTER: Is the Age of Serial Killers at an end?

20 Best Serial Killer Biography Books of All Time - BookAuthority

Hearts of Darkness (Ebook)

The Zodiac Killer – The Wrangler

The Night Stalker always left a pentagram on his victims… and 6 other chilling serial killer calling cards

Halloween: 10 scariest horror movie villains from Chucky to Jason

Northeast Ohio's most notorious serial killers

Top 10 Real-Life Serial Killer Calling Cards

6 of the Most Notorious Serial Killers Who Were Never Caught