Also known as the Casanova Killer, Knowles used his charm into making victims believe him and later killed them. He killed a total of 18 people, although the count might be more. His victims included men, women and children. The man from Florida was eventually killed by an FBI agent in 1974

Between 1974 and 1991, Dennis Raider murdered 10 people in Wichita, Kansas. He even sent letters to police taunting them under his alias name BTK which stood for ‘Bind, Torture, Kill’. His technique was to stalk his victims before breaking into their homes, binding their limbs and finally strangling them.

Patrick Wayne Kearney also called the Trash Bag Killer, he operated between 1975 -1977. Kearney had a high IQ but once captured, he confessed to 32 murders of homosexual men. Kearney would dump their bodies along California highways and wrapped them in trash bags thus earning the name. He was convicted

Cullen worked as a nurse in many hospitals but kept switching jobs as he was fired for suspicious behaviour from many of them. He confessed to murdering 40 elderly patients in New Jersey from 1984 to 2003. He did this by poisoning his patients to death with unprescribed medication. He

Andrei, the Butcher of Rostov, said, “When I used my knife, it brought psychological relief. I know I have to be destroyed. I was a mistake of nature.” He was responsible for sexually assaulting, killing and mutilating 53 women and children between 1978 and 1990 in Russia. After being captured

He was also known as the ‘Chessboard Killer’ and the ‘Bitsa Park Maniac’. His targets were homeless men whom he lured to his house with vodka. He is believed to have killed 49 people, most of them with repeated hammer blows to their heads and inserted a vodka bottle into

The cattle-breeder from Indonesia admitted to killing 42 girls and women between 1986 to 1997. As a part of his ritual, he used to bury them waist deep. Bodies were found in a sugarcane field with their heads facing his house, which he believed would give him more power. Suradji

The real killers or killer were never identified. The name came into being because the victims had organs missing and judging by procedure the killer seemed to have surgical experience. Jack the Ripper who was later believed to be a single person killed female prostitutes in the slums of London between 1888-91.

He got more names due to his hideous acts. Some of them were The Otaku Murderer, The Little Girl Murderer or Dracula Miyazaki. The reason for this being that he abducted little girls, killed them and indulged in sexual activities with their corpses. On one occasion, he not only drank the victim’s blood

Aileen Wuornos is the lone woman on this list, though there have been a fair number of female serial killers in American history. Coming from another broken family, Wuornos got pregnant by the age of 15 and soon became a wandering prostitute, hitch-hiking from state to state. From a young