The Connecticut River Valley Killer: In the 1980's, this serial killer stabbed at least seven women to death.

The Frankford Slasher: The Slasher raped and murdered 8 people around Frankford, PA, between 1985 and 1990.

Night Stalker: This killer raped and murdered at least 13 people in Southern California between 1976 and 1986. He also sexually assaulted at least FIFTY women.

The Rainbow Maniac: He murdered 13 men in Brazil in 2007 and 2008. He shot all of his victims in the head at Paturis Park.

Beer Man: From Mumbai, India, he killed at least seven people in his hometown from 2006 to 2007. He was called the beer man because a bottle of beer was always found next to the bodies of his victims.

The Freeway Phantom: He kidnapped, raped and strangled at least six young women in Washington D.C. in between 1971 and 1972.

The Colonial Parkway Killer: This man killed at least three couples in between 1986 and 1989. He is also believed to responsible for the murders of at least eight people int he state of Virginia. Authorities thought he had a partner.

The Honolulu Strangler: At least five women died at this mans hands in 1985 and 1986. He strangled them to death.

Stoneman: Thirteen people in Calcutta, India, died in 1989 because of this killer. Most of his victims were the homeless who slept on the streets.

The Atlanta Ripper: This killer murdered at least fifteen women in and around Atlanta in 1911 typically, he slit their throats.

Phantom of Heilbronn: In 2007, he murdered a police officer. He went on to kill nearly 60 more people around Europe.

The Monster of Florence: This lovesick serial killer was known to shoot couples in secluded areas. He would often mutilate the female victims. In total, he murdered sixteen people or eight couples. He was an Italian version of Jack the Ripper.

Servant Girl Annhilator: In 1884, this killer went on a spree in Austin, Texas on New Years Eve. He raped and sliced the face of his victims using an axe. All of his eight victims were servants

The Zodiac Killer: This Jack the Ripper style killer terrorized San Francisco. He would even send cryptic notes to the police. He targeted and killed four men and three women.

Delphine LaLaurie: The insane Ms. LaLaurie started her killing spree in 1831. Behind closed doors, she abused, tortured and killed them.

The Babysitter Killer: This Michigan man killed at least four children between 1976 and 1977. He abducted the children and then killed them by suffocation, shooting or strangulation.

The Phantom Killer: This man was responsible for the moonlight murders in Texarkana in Texas and Arkansas in 1946. He attacked eight people and murdered five of them with a .32. He killed on weekend nights, earning him the nickname of the Moonlight Killer as well.

The I-70 Killer: In the early 1990s, this killer left the bodies of his victims near I-70 in multiple states. There are approximately 6-10 victims of this monster and no suspect was ever discovered.

The Doodler: He killed fourteen men and assaulted three others in the San Francisco area from 1974 to 1975. He would draw his victims before having sex with them and killing them. He targeted his victims in gay establishments.

The Hammersmith Murderer: At least six prostitutes were killed during his active years. The bodies of the victims were dumped into the River Thames.

The Cleveland Torso Murderer: Also known as the Mad Butcher of Kingsbury Run, he murdered AND dismembered at least twelve victims in Cleveland, Ohio during the 1930's. He would also behead them and even cut their torsos in half.

The Grim Sleeper: From Southern California, this man killed at least ten people in LA from 1985 to 2007. He got his name because he didn't strike for a period of 14 years before he resurfaced within the last decade. A suspect has been arrested, but not charged.

Charlie Chop-Off: In Manhattan between 1972 and 1974, this man killed and mutilated his victims. His victims were all black children. He killed five and left one for dead.

The Axe Man: This notorious killer of New Orleans was responsible for at least eight murder cases. He killed between May 1918 and October 1919. He used an axe or a straight razor. In 1919, he wrote a letter to the public where he claimed that he was basically an Angel of Death.

The Bone Collector: This mysterious killer was from West Mesa of Albuquerque, New Mexico. He killed eleven prostitutes, whose bodies were excavated from a dumping ground.