2.The Russian killer Alexander Pichushkin was nicknamed the "Chessboard Killer" because his goal was to kill 64 people, which is the exact number of squares on a chessboard.
3.Niels Hoegel, a German nurse, intentionally injected his patients with drugs to cause heart failure, because he liked showing off his resuscitation skills to colleagues.
4.Professor Mohan Kumar, aka "Cyanide Mohan", lured young women into marrying him and killed them the next day by giving them birth control pills laced with cyanide.
5.Leonarda Cianciulli from Southern Italy converted her three middle-aged victims into soap and cake, which she gifted to her friends later.
6.On 16 March 2000, a Pakistan court sentenced Javed Iqbal, a murderer of 100 boys, to be strangled to death with an iron chain, diced into pieces, and dissolved in acid the same way he killed his victims.
7.Dr Marcel Petiot, who murdered 27 people, served as a mayor of the town of Villeneuve-sur-Yonne, France.
8.Robert Hansen, a quiet baker from Alaska, would kidnap female sex workers, only to release them later in the wilderness and hunt them down with his rifle.
10.The French serial killer Michel Fourniret developed an obsession with killing virgins after he realized his first wife wasn't chaste before marriage.
11.Takahiro Shiraishi offered suicide pacts to nine women before killing and dismembering them.
12.The Iranian newspapers dubbed Saeed Hanaei's murders as the "Spider Killings" because he brought his victims, female sex workers, into his house, strangled them with a scarf, and then dumped their bodies next to open sewers.
13.Despite being convicted for the murders of 110 girls, Pedro López was released from a psychiatric hospital in 1998 for good behavior.