He dressed up as Pogo the Clown for children's parties, etc.
The Night Stalker
He entered homes in the dead of night.
His M.O.: Bind, Torture, Kill.
Green River Killer
Green River was his favorite dumping site for bodies.
He killed in Rostov Oblast, a federal subject of Russia.
The Chessboard Killer
He strove (and failed) to kill 64 people: one for every square on a chess board.
Son of Sam
Also known as the .44 Caliber Killer, Berkowitz claimed to be driven by demons controlled by his neighbor named Sam.
The Boston Strangler
As one would expect, he strangled women in Boston.
Reason for Nickname
The Vampire of Dusseldorf
His murders were gory and violent, as if committed by a vampire.
The Coed Killer
Most of his victims were hitch-hiking Californian coeds.
The Ghoul of Plainfield
His crimes, committed in Plainfield, WI, were especially deviant and 'ghoulish,' including grave-robbing and necrophilia.
The Moors Murderers (2 possible answers)
This murderous couple buried their five young victims in the moors, and picnicked on their graves.
The Giggling Granny
Doss reportedly giggled with delight while confessing to poisoning numerous relatives.
Kaczynski, an eccentric, reclusive genius, mailed bombs to his victims or left them in inconspicuous places. In his FBI codename prior to his capture, 'un' stood for 'university' and 'a' stood for 'airlines,' two of his common targets.
Like the Bluebeard of legend murdered his brides, Gunness murdered possibly dozens of suitors for their money before her house burned down and she mysteriously vanished.