Writing can sometimes be considered a type of therapy, and people with traumatic past are often advised to write down their experiences. Authors are usually encouraged to write what they know.
Some people's backgrounds, however, are more colorful than others. For those with secrets in the past, writing from experience can be difficult and sometimes even dangerous.
Here's a look at 10 authors who have really written from experience.
10 Liu Yongbiao
The Chinese criminal author Liu Yongbiao had already written several crime novels when he wrote the introduction to his book The Guilty Secret . In it he spoke about his upcoming novel, The Beautiful Writer Who Kill in which, as announced, a good-looking writer was present, who gets away with murder. In fact, a series of murders.
Liu was a member of the Association of Chinese crime writers and had already serialized one of his novels into a major television series. He talked about his ambition to become a film The Beautiful Writer Who Kill .
One with a twist probably. Twenty-two years earlier, Liu Yongbiao had committed four murders. Together with an accomplice, Liu had tried to rob a hotel guest. When he resisted, they killed him. To cover up the crime, they also murdered the hotel owner, his wife and their 13-year-old grandson.
Liu Yongbiao never published The Beautiful Writer Who Kill . He was sentenced to death for his crimes, a punishment that was quickly executed. His last act as a writer was a letter to his wife in which he confessed the crimes and said, "Now I can rid myself of the spiritual torment that I had for so long." 
9 Kenneth Halliwell  Kenneth Halliwell was the lover of the playwright Joe Orton. Although they had written several books together, Orton's fame began to darken Halliwells, and a jealous rupture arose between them.
Halliwell had a difficult life. At the age of 11, he witnessed the accidental death of his mother. At age 23, he discovered the body of his father, who had gassed in the oven.
In 1962, while both were aspiring writers, Orton and Halliwell were sentenced to six months in separate prisons for falsifying library books, a punishment that seems ridiculously hard. Maybe it was the homosexual allusions in the graffiti that cut off the judge. 
Upon their release, Halliwell's career failed, while Orton erupted with such hits as Loot . Halliwell believed that he had taught Orton to write. Halliwell found it particularly annoying when Orton's work was a wild success and his own one was lost.
In 1967, Halliwell attacked Orton with a jealous anger by repeatedly beating his head with a hammer. Then Halliwell ended his last chapter with an overdose of antidepressants.
8 Richard Klinkhamer
In 1992, Richard Klinkhamer, a small Dutch writer, entered Mince Day with his new manuscript on Wednesday in his publishing office. She examined seven ways in which Klinkhamer could have killed his wife and dumped her body. Since his wife had been missing for a year at that time, it seemed tasteless. The publisher refused the book and said it was "too cruel."
The authorities had almost immediately suspected Klinkhamer of murdering his wife. Despite careful searches of the house and garden, they found nothing even with infrared scanners. Without a body the police could not do anything.
Rumors of his guilt remained, however, especially when the news of the manuscript appeared. In 1997, Klinkhamer sold the family home and moved away with his new girlfriend. The new owners settled in Klinkhamers old house.
Nothing was heard of Klinkhamer's wife Hanny until three years later the new owner decided to rebuild the garden and remove an old shed. They discovered her body buried under the concrete floor.
Richard Klinkhamer was arrested and charged with murder. His publisher was suddenly interested in his book. With a threat of murder charges Klinkhamer finally recognized the importance of discretion and rejected the publication offer.  
Ultimately, Klinkhamer was sentenced to seven years in prison for manslaughter two for good behavior. He died in 2016 at the age of 78 years.
7 Jack Unterweger
The life of Jack Unterweger seems to have been strange and brutal. Born in 1950, he was the son of an Austrian prostitute and an American GI who had deserted her after the war. Unterweger was educated in Austria by his aunt, who was also a prostitute. After Unterweger was murdered by a client, he was raised by his grandfather, an alcoholic who brutally beat the boy.
In the face of this unfavorable beginning, Unterweger soon became a crime. In 1974 he murdered the 18-year-old Margret Schäfer. He told the court that he saw his mother's face the moment he killed Schafer and strangled her with her own bra in a rage when he was abandoned as a boy.
He was sentenced to life imprisonment. There he began to read a lot and even wrote his autobiography, which he named Purgatory . The book was highly praised by critics, and its honesty and articulation prompted many readers to file an application for early release.
Unterweger was released in 1990 after 15 years in prison, and his release was generally welcomed. The governor of the prison said, "We will never find a prisoner so well prepared for freedom."
Unterweger became a celebrity, appeared on talk shows and gave press interviews. In September 1990, however, the body of a murdered prostitute was discovered. She had been strangled with her own underwear. A few weeks later another death followed swiftly. 
In 1994, Unterweger was found guilty of the deaths of nine other women and sentenced to life imprisonment. The day after his conviction, Jack Unterweger hanged himself in prison with his bootees.
6 Francois Villon
Francois Villon, born in Paris in 1431, is considered one of the greatest French poets. His most famous work is Le Grand Testament a voluminous document proving his mastery of poetic form as well as his reflections on such joys as age, illness and dread.
However, Villon was also a clear-cut villain who spent much of his life in prison. In 1455 Villon was involved in a brawl and ended the fight by stabbing a priest with his dagger. Although he was originally sentenced to death, his sentence was amazingly reduced when he was banished from Paris, and even this meager punishment was quickly transformed by a royal pardon. Soon after his return, he led a gang that had stolen gold coins from the University of Paris and banished them again.
In one of his detention periods Villon wrote that he regretted his past behavior, but that his rehabilitation was not permanent. Several brushes followed with the law. After his arrest for another brawl, Francois Villon fled Paris for the last time and was never seen again. 
5 Thomas Griffiths Wainewright
Thomas Griffiths Wainewright was a talented artist and writer. His paintings are in the Australian National Portrait Gallery and his work was published in London Magazine an influential literary magazine of the time.
His first foray into crime and writing came in. In 1817 he began signing checks on behalf of his cousin for large sums of money. Then Wainewright's sister-in-law Helen died suddenly, shortly after completing several life insurance policies.
Helen was a healthy, healthy woman of only 20, who had no reason to think about her mortality. Suspicions were raised, whereupon the insurance companies refused to pay.
The analysis indicated Helen's body showed signs of strychnine intoxication, although this could not be proven. During the subsequent trial, the suspicion of the death of Wainewright's uncle, mother-in-law and sister-in-law was further raised.
They all died under odd circumstances, although no charge was made for these deaths. In fact, no charges could be made, even in relation to his sister-in-law, because at that time there had been no definitive tests for strychnine intoxication. 
However, during Wainewright's investigation, the earlier counterfeits were uncovered and he was sentenced to life promotion to Australia. After Wainewright worked for a few years on a chain gang, he was granted some freedom after a fatal illness. He focused again on his writing and painting and specialized in portraits of his fellow prisoners.
4 Louis Althusser
Louis Althusser was a Marxist philosopher. Born in France in 1918, Althusser joined the French army at the outbreak of World War II, was captured in 1940 by German troops and spent the remainder of the war in a POW camp. His experiences influenced him greatly and shaped his philosophical and political opinions.
In 1948 he joined the French Communist Party and took a job at a Paris University. Althusser seemed to live the life of a quiet intellectual. He wrote a series of philosophical works on Marxism, modestly teaching and living with his wife.
In 1980 he appeared to have a nervous breakdown. He strangled his 30-year-old wife in a manic-depressive state that he said he could barely remember. Althusser was declared incapable of trial and spent some time in psychiatric hospitals before returning to the university.
However, his posthumously published memoirs told a different story about the death of his wife and his entire life. Althusser confessed that he was not well-read, had not studied the works of Karl Marx and often chattered the work of others. Far from being the great philosopher whom the French public believed him to be, he claimed he had committed fraud throughout his life.
Althusser described the death of his wife in great detail, although he claimed to have been in the midst of a maniacal episode at that time and barely remembered it. It seemed to him a pleasure to describe how he "stroked" his wife's throat when he strangled her. 
3 Mary Lamb
Mary Lamb had a difficult life. Without formal education, she had taught herself to read and write. From an early age she was responsible for the care of her sick mother. Like her brother, Mary had seizures of a serious mental illness.
In 1796, Mary stabbed her mother while she was in a maniacal episode. She was declared insane and placed in the care of her brother, the writer Charles Lamb.
In 1807, Charles Lamb Tales from Shakespeare published a retelling of the Shakespeare stories for children. The book was extremely successful and was never sold out.
The name of Charles alone was on the title page of the book. However, it was largely, though not completely, written by Mary. It contained 20 stories, of which Mary has written at least 14 today. 
Mary survived her brother for more than a decade. After his death, she spent much of that time in an asylum. During her lifetime, she received no public recognition for her work.
2 Harry Horse
Harry Horse was a children's book author and illustrator who moved 161 kilometers off the coast of Scotland to the Shetland Islands, with his wife over 18 years old. Mandy was diagnosed with an aggressive, terminal form of multiple sclerosis. When both of them were found dead, it was widely reported that the two had died in a Romeo-and-Juliet-style suicide because he could not bear to live without them.
Unfortunately, the truth was completely different. Harry was prone to depression and started using drugs, including those prescribed for his wife. Locals on the island witnessed his sudden attacks of uncontrolled anger.
In January 2007, Harry Horse's anger exploded for the last time. He stunned and stabbed his wife in a wheelchair. Reports of her injuries indicated that she had been stabbed 30 to 40 times and that Horse even had to get a new knife when the first knife broke. After killing his wife, Horse killed himself. 
Nobody knows why Horse, who seemed so devoted to his wife, suddenly lost control in such a violent and catastrophic way. Some believe that what might have started as a suicide pact turned into a murder when the drugs they took failed.
1 Krystian Bala
In December 2000, a man's body was washed up at the banks of a river in Poland. He had suffered repeated beatings, and his body had several knife wounds. Forensic investigations showed that the man was half starved after his death.
He was also so tied up with a single piece of rope that he would have been strangled in an attempt with the cord around his neck freeing you yourself. These particular circumstances were not disclosed, and the murder remained unexplained.
One year after the case was closed, it was discovered that Krystian Bala had somehow taken possession of the victim's phone and sold it over the Internet for just three days after the man disappeared and several weeks before the body was found has been. This made Bala aware of the police as "interested person" in this case.
When Bala published a novel Amok her interest was awakened some time later. The novel had sold poorly, probably due to extreme sexual violence and even bestiality. One section, however, was of particular interest.
Bala had described in detail the murder of a woman. The description was eerily akin to the corpse of the businessman who had been washed ashore. The peculiar method of capturing the victim was the same.
Further investigation showed that Bala had a keen interest in the progress of the police investigation and even regularly reviewed websites about the crime. The police raided Bala's home and found a number of items of the victim. Worst of all, the businessman had gone out with Bala's former wife before he disappeared.
This circumstantial proof – and even the confession that was later withdrawn – may not have been sufficient to secure a conviction. But Bala felt compelled to relive the experience of writing, and then was stupid enough to publish it. Eventually, he was sentenced to 25 years in prison for murder. Ward65 is a traveling writer, and occasionally a travel writer.