Serial killer

Some people do very bad things. They hurt many people over time.

This can happen in many lands. A person might do this for many reasons. They might act out of anger.

They might want to get things from others. These people often hurt others in different places. This is a sad part of history. Police work hard to stop them. They use new tools to help. We learn from the past.

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A serial killer is a person who kills others. They kill three or more people in separate events. These killings happen over a long period of time.

Some experts say the count can be two or more.

People have different reasons for these crimes. They might act out of anger. They might want money. They might even want attention.

This has happened throughout history. Long ago, a man named Liu Pengli lived in China. He killed at least 100 people. In the 1800s, a man named Juhani Aataminpoika killed many people in Finland.

In 1888, a killer known as Jack the Ripper killed women in London. This case was famous all over the world.

In the United States, these crimes were very common from 1970 to 2000. This time is called the "golden age" of serial murder. Today, these crimes are less common. Police use better tools to find killers. People also act more carefully. This helps keep many people safe.

A serial killer is a person who commits multiple murders. Most researchers say a person must kill three or more people to fit this label. These crimes must happen in separate events over a long period of time. Some experts use a different rule for the FBI. They say the count can be two or more victims. The killings usually happen in different places. This is different from a spree killer who kills many people in a very short time.

People who commit these crimes often have similar traits. They might have different personality disorders. Some may suffer from mental illness. This can lead to a person believing they must act in a certain way. The reasons for these crimes vary a lot. A killer might act out of anger or a need for money. Some may seek thrills or want to get attention. Victims often share things in common like their age or appearance.

These events have happened throughout history. Long ago in China, a man named Liu Pengli killed at least 100 people. In the 15th century, Gilles de Rais was accused of killing many children in Europe. In 1610, Elizabeth Báthory was arrested in Transylvania. She was alleged to have killed many young women. In the 1800s, Juhani Aataminpoika killed 12 people in Finland.

Some famous cases changed how the world looks at crime. In 1888, Jack the Ripper killed women in London. This case became a worldwide news event. It helped police create new ways to investigate crimes. In the early 1890s, H.H. Holmes became well known in the United States. In South America, Pedro Lopez killed many young girls. He was known as the Monster of the Andes.

Serial killings were very common in the United States from 1970 to 2000. Some people call this the "golden age" of serial murder. This happened partly because more people moved to big cities. In cities, it is easier to stay anonymous. However, these crimes have gone down since 1989. Police now use much better forensic technology. People also tend to behave more cautiously today.

A serial killer is an individual who commits multiple murders. Most researchers use a baseline of three or more murders to define this group. These killings must occur in separate events over a period longer than one month. They also usually happen in different locations. The Federal Bureau of Investigation (FBI) uses a slightly different standard. In 2005, experts at an FBI symposium in San Antonio, Texas, settled on a specific definition. They define serial murder as the unlawful killing of two or more victims by the same offender in separate events. This change was supported by researcher Enzo Yaksic. He noted that these killers often share similar pathologies, or mental patterns.

It is important to distinguish serial killers from other types of offenders. A spree killer engages in many killings over a period of days or weeks. The main difference is the cooling-off period. A cooling-off period is a significant break between murders where the killer returns to a normal life. Spree killers do not have this break. Some experts even suggest a hybrid category called a "spree-serial killer" for those with extended bouts of killing. Other categories include mass murderers and contract killers. While these groups overlap, the element of time is the primary way to tell them apart.

Serial killers are driven by many different motives. The FBI states that motives can include anger, thrill-seeking, or attention seeking. Some killers may also act for financial gain. These individuals often have various personality disorders. Some may experience mental illness, such as psychotic breaks. During a psychotic break, a person might believe they are someone else. They might also believe they are compelled by other entities to commit crimes. Victims often share common traits. These can include their gender, race, or demographic profile.

History shows that serial killers have existed for many centuries. In 144 BC, a Chinese man named Liu Pengli was accused of murdering at least 100 people. He led groups on expeditions to seize belongings and kill for sport. In the 15th century, Gilles de Rais was alleged to have killed between 140 and 800 children in Europe. In 1610, the Hungarian aristocrat Elizabeth Báthory was arrested. She was accused of killing as many as 650 young women. In the 19th century, Juhani Aataminpoika killed 12 people in Finland during 1849.

Certain cases changed how society and law enforcement operate. In 1888, the unidentified Jack the Ripper killed at least five women in London. This case created a massive worldwide media frenzy. It also led to the development of modern criminal investigation techniques. Police used house-to-house inquiries and collected forensic material. Surgeon Thomas Bond even created one of the first character profiles. In the early 1890s, H.H. Holmes gained notoriety in the United States through sensationalized newspapers. In South America, Pedro Lopez killed at least 110 girls. He was known as the "Monster of the Andes."

In the United States, serial killings were very prominent from 1970 to 2000. This era is often called the "golden age of serial murder." One reason for this was urbanization. As more people moved to cities, they lived in close proximity. This also offered more anonymity to criminals. However, the number of active serial killers in the U.S. peaked in 1989. Since then, the numbers have steadily trended downward. This decline happens alongside a general decrease in overall crime in the country.

Experts suggest several reasons for the decline in these crimes. Professor Mike Aamodt attributes this to improved forensic technology. Better science helps police catch offenders more quickly. Other factors include less frequent use of parole. People are also behaving more cautiously in modern society. Some researchers also look at broader social changes. These include increased incarceration and changes in early childhood lead exposure. Understanding these patterns helps researchers study the complex relationship between society and crime.