1. Kentucky - Donald Harvey
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Born in Ohio, American serial killer Donald Harvey spent much of his life living and working in Kentucky, at the Marymount Hospital. There, between 1970 and 1987, he began killing patients by purposely cutting off their oxygen supplies. His total victim count stands at between 37 and 57 patients, which gained him the title 'angel of death'.2. New York - David Berkowitz
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Calling himself the Son of Sam, Brooklyn native David Berkowitz terrorised New York in the summer of 1977. Despite a huge man hunt and media attention, he managed to escape capture and patronised the police in mocking letters. In total, he killed eight people, but the psychological affects of his killings on the city were far greater.3. Illinois - John Wayne Gacy
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John Wayne Gacy is one of America's most notorious serial killers, who murdered 33 young boys and men in Illinois starting in the early 1970s. He killed all of his victims in his home before storing the bodies in the crawl space between the foundations and the ground floor. Gacy is also known as the 'Clown Killer', as he met many of his victims at children's parties where he dressed up as a clown.4. Maine - Christian Nielsen
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A cook at a restaurant in Maine, Christian Nielsen was convicted in 2007 of killing four people during a Labor Day weekend celebration. He killed his victims over a two day period and dismembered their bodies with a chain saw, hacksaw, and axe. To this day, the police don't understand why he did it.5. Louisiana - Derrick Todd Lee
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Derrick Lee is widely known as the Baton Rouge Serial Killer, which should tell you enough about his danger level. He murdered seven women around Baton Rouge between 1992 and 2003, and was only convicted in 2004. During the manhunt for Lee, he was placed at number three on the list of American's top 10 fugitives of 2002.6. Pennsylvania - Harvey Miguel Robinson
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Harvey Robinson is one of the youngest serial killers in America's history, and certainly one of the most dangerous people from Pennsylvania (he is still imprisoned on death row today). He started killing aged just 17, and eventually killed three women and attempted to kill a further two.7. California - Thomas Silverstein
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Thomas Silverstein spent 42 years in prison after being arrested for armed robbery along with his father and cousin. In prison, he developed a reputation as a dangerous and lethal killer, and eventually was put in solitary confinement at a high-security prison for 32 years after killing a Correction Officer.8. Texas - Clyde Thompson
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Clyde Thomas is known as the "Meanest Man in Texas" for his ruthless killing sprees, which took place even while he was incarcerated. By 1935, he had received three life sentences, and spent time in a prison known as Little Alcatraz for holding only the most dangerous killers.9. Florida - Daniel Harold Rolling
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Daniel Rolling is such a prolific murderer that he is said to have inspired the Scream films. In 1990, Rolling began a violent killing spree on the campus on University of Florida, killing five students in just four days. He even mutilated the bodies to keep souvenirs from his killings.10. Virginia - Charles Stanard Severance
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Charles Severance's crimes are somehow even more horrifying because he killed in broad daylight, scaring neighbours throughout the city of Alexandria, Virginia. Horrifically, he would knock on a stranger's door and immediately shoot them with his gun. In total, he killed three times and was sentenced to life in prison plus 48 years.11. Alaska - Robert Hansen
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Robert Hanson was also known as "Butcher Baker", as is most certainly one of the most dangerous people from the isolated state of Alaska. Between 1971 and 1983, Hansen raped and murdered at least 17 women in and around Anchorage, but it's suggested that he assaulted over 30.12. Georgia - Wayne Williams
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There's nobody who even comes close to Wayne Williams when it comes to the most dangerous person in Georgia. He is suspected of committing many of the so-called Atlanta Child Murders between 1979 and 1981. He was eventually only convicted of two, but after he was put away, the murders stopped.13. Utah - Gary Ridgway
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Gary Ridgway is probably one of the most dangerous people in the US, never mind in Utah. Called the Green River Killer, he was convicted of 48 murders in Washington, mainly of teenage girls and women. His main MO was strangling, though he would sometimes have his victims run from him in the woods near his house so he could 'hunt' them.14. Washington - Robert Lee Yates
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Yates killed at least 11 women in Washington, most of which were sex workers working in Spokane. He killed most of his victims by shooting them in the head, before dumping the bodies in rural areas.15. Massachusetts - Alfred Gaynor
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Alfred Gaynor started his killing spree in 1995, when he killed a 45-year-old woman in her own apartment. After that, he started killing more regularly, a few women each year, often raping them as well. He was finally arrested in 1998 and received four life sentences.16. Ohio - Anthony Sowell
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The "Cleveland Strangler", Anthony Sowell killed 11 women around Cleveland, Ohio. In the end, his crime was only discovered when bodies were uncovered in the backyard of his home. We can't imagine how grisly this must have been for the police officers who found it.17. New Jersey - Charles Cullen
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Like the 'angel of death' Donald Harvey, Charles Cullen was also a hospital worker who killed his own patients. Though police have officially linked him to 29 victims, they suggest that he could have killed up to 400 people - making him without a doubt the most dangerous person on this list.18. Arizona - Robert Comer
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Robert Comer was deemed so dangerous, he was the first prison inmate to be put to death in Arizona since 2000. He was convicted of murder after the killing of camper Larry Pritchard near Apache Lake in Arizona in 1987. After stabbing Pritchard in the neck, Comer and his girlfriend stole some of their victims' belongings, including his dog.19. Michigan - Tamera Williams
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Tamera Williams is still wanted for the brutal murder of her boyfriend, David Carter. This makes her one of the most dangerous people in Michigan right now. David's remains were found along a stretch of highway in Michigan - Tamera had killed and dismembered him. Now, rewards stand at $10,000 for information.20. South Carolina - Henry Louis Wallace
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Henry Louis Wallace is a serial killer who killed 11 black women in South Carolina between 1990 and 1994. His first victim was an 18-year-old student, whose body he dumped in a lake. He was finally arrested in March 1994, and over 12 hours he confessed to his horrific crimes.21. Oregon - Dayton Leroy Rogers
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Dayton Rogers currently sits on death row in Oregon for his crimes. His nickname was the 'Molalla Forest Murderer', as he dumped many of his victims' bodies in rural forest in Molalla, Oregon. He would most often pick up prostitutes and kill them in the forest.22. Indiana - John Dillinger
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We're going back in time for this criminal. John Dillinger was the leader of the Dillinger Gang during the Great Depression, and was a well-known criminal with a colourful personality. However, he was also highly skilled, and he and his gang became some of the most dangerous people in Indiana at the time.23. Minnesota - Paul Michael Stephani
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Paul Stephani killed a number of women around Minneapolis and Saint Paul in the 1980s. Stephani's case is interesting, as he would often call up police after the murders and plead with them to find him, saying he couldn't stop killing. Because of this, he was known as the Weepy-Voice Killer, because of the remorseful way he would sound on the calls.24. Maryland - Joe Metheny
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Joe Metheny might be one of the scariest killers on this list, and is certainly one of the most dangerous people from Maryland. He is known to have killed five people, but the most shocking thing about his crime is that he frequently ate the flesh of his victims, and may have also cooked it into hamburgers which he sold to unwitting people.25. Tennessee - Michael Cummins
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In April 2019, the people of Tennessee were left reeling after the deadliest mass killing in over 20 years. In total, eight victims were found across Sumner County, including one which was headless. The killings were perpetrated by Michael Cummins, who is still waiting to stand trial owing to delays.26. Missouri - John Robinson
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He might look like a sweet man, but this is one of the deadliest serial killers to come from the state of Missouri. John Robinson was sentenced to death not once but twice and is thought to have killed many more than the three people he is convicted for. Many of his suggested victims vanished without a trace, and have still never been found.27. Oklahoma - Mikell Patrick Smith
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This one is confirmed - Mikell Patrick Smith has actually been described as the "most dangerous man" to ever be admitted to prison in Oklahoma. Since being admitted, he has killed multiple other inmates and prison guards, and had to have a special cell built for him because of his lethality.28. Connecticut - William Devin Howell
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William Devin Howell is widely known as one of the most dangerous people in Connecticut's history. His victims - all women - all disappeared in 2003, but some of their bodies weren't found until as late as 2015. In 2017, while already in prison for manslaughter, he was convicted of six life sentences, equalling 360 years in prison.29. Kentucky - Boone Helm
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The "Kentucky Cannibal" may be one of the earliest American serial killers, as well as one of the most dangerous people from Kentucky. As is obvious from his name, he's known for eating many of his murder victims, sometimes for survival but sometimes for plain enjoyment.30. Nevada - Patrick McKenna
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Patrick McKenna is widely known as Nevada's most dangerous prisoner. Before his death, he was the longest serving inmate on death row in the state, and was first sent to prison when he was just 14. During his time in prison, he killed a Correctional officer and his own cellmate.