Buchanan was reported as a sexual predator more than 20 years ago
Michael Buchanan was first reported to police as a predator more then two decades ago but managed to remain at large tocontinue with his catalogue of depravity.
The child victim who initially revealed his crimes did not live to see him being brought to justice because she committed suicide in 1998, only for her abuser to carry on and commit further offences.
Sentencing Buchanan, the judge, Lord Boyd of Duncansby, told the 46-year-old: “You pled guilty to 16 charges involving 13 victims, 12 of them children, spanning a period of 21 years.
Buchanan was just 12 when he targeted his first victim
“I take into account that the first three charges were committed when you yourself were a child.”
The High Court in Edinburgh heard that the child victims were aged between four and five and 14 years old and that the most serious offences were the rapes of girls aged six and 13 at the time of the attacks.
Lord Boyd said background reports revealed Buchanan, from Edinburgh, was at a high-risk of re-offending and that he should be kept under supervision for a further five years following his release.
Buchanan was aged 12 when he targeted his first victim, molesting a boy at addresses in the Wester Hailes area of the capital.
You pled guilty to 16 charges involving 13 victims
Lord Boyd of Duncansby
He later invited a nine-year-old girl back to his family home and attacked her.
The victim was so scared that, initially, she did not tell anyone. But after revealing what had happened to a friend when she was about 12 the girl was encouraged to contact the police.
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She gave a statement and Buchanan was detained in 1993.
Buchanan's victims were between age four and 14-years-old
But no action was taken and five years later the victim committed suicide.
The court also heard that Buchanan subjected another youngster to a catalogue of physical and sexual abuse and raped her on two occasions.
It was only in 2014 when a male victim of Buchanan’s went to police to report that he had been abused by him that a search of a database revealed previous complaints and steps were taken to investigate.
Defence counsel Matt Jackson said Buchanan had spoken about “what he calls his inner monster” – the person he felt was responsible for the attacks.
Buchanan was also placed on the sex offenders register.