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We asked members of the BuzzFeed Community to share the scariest fact they know about a serial killer. Here are some of the most haunting replies:
3. Robert Pickton, the "Pig Farmer Killer," would process his victims' bodies in the same processor he would put pigs in to make ground pork. It is very likely that the townspeople he serviced unknowingly ate human remains.

Jane Wolsack / CP
4. Jeffrey Dahmer convinced police that his escaped, injured victim was his partner and they were having a "lover's quarrel."

Anonymous / ASSOCIATED PRESS
5. Rosemary and Fred West murdered half their children and would tell the living children to "behave, or [they] would end up under the patio like [their other child]."

Anonymous / ASSOCIATED PRESS
7. DeAngelo told the cops he had a roast cooking in the oven when the police showed up to arrest him.

Rich Pedroncelli / AP
8. Ed Gein was a babysitter.

Anonymous / ASSOCIATED PRESS
9. Dennis Rader, the "BTK Killer," was the president of his church.

Travis Heying / AP
10. Rader would strengthen his hand and arm muscles by using a stress ball.

Andreypopov / Getty Images
11. Israel Keyes kidnapped a girl and sent her family a photo of her body for ransom money. The victim was assumed to be alive, but she was actually dead and Keyes had sewn her eyes open to make her appear alive in the photo.

ABC News
12. Rodney Alcala won The Dating Game while on his killing spree.

ABC
13. Richard Chase, the Vampire of Sacramento, would check the doors of homes to see if they were locked. He believed unlocked doors were an "invitation."

14. Richard Chase was interviewed while he was in prison. During it, he pulled out a handful of macaroni and cheese and handed it to the interviewer because be believed the guards were poisoning his food.

Subjug / Getty Images
16. Michael Swango was a licensed physician who bounced from hospital to hospital, killing his victims via lethal injection.

Ed Betz / ASSOCIATED PRESS
17. Robert Hansen, the "Butcher Baker," was a serial killer from Alaska who would kidnap women and let them loose in the wilderness, only to hunt them down and kill them.

Alaska Daily News / AP
18. The "Oakland County Child Killer," whose identity is still unknown, kidnapped and killed Timmy King. When Timmy was reported missing, his mother wrote a letter to the local newspaper begging for his safe return so that she could feed him his favorite meal, Kentucky Fried Chicken. When Timmy's body was found, there were chicken remnants in his stomach.

Sittitap / Getty Images
19. Richard Ramirez, the "Night Stalker," was identified by his victims by his bad teeth.

20. Leonarda Cianciulli killed three women in her Italian hometown because she believed their sacrifice would keep her son safe during World War II.

USA Network
21. Nannie Doss, the "Giggling Nanny," got her nickname because when she would talk about murdering her husbands, she would laugh.

Anonymous / ASSOCIATED PRESS