WATCH: Paedophile child-killer early prison release protest

The sisters of a murdered Scottish schoolboy are pleading with authorities to block his killer's release from prison.

Paedophile Steven Leisk abducted and killed Scott Simpson in Aberdeen in 1997.

A parole board will meet in November to decide whether he can be released after serving more than twenty years behind bars.

But thousands of people are signing an online petition to stop one of Scotland's most notorious child-killers from walking free.

In her first-ever broadcast interview, one of Scott's sisters, Sarah Watt says he should stay in jail.

"He will always be a monster. He's done sentences a few times, come out, and re-offended" - CHARLENE CLARK (Scott's sister)

Speaking exclusively to us she said: "The man who strangled Scott is a serial sex offender. He's a danger to all children if he gets parole. We're trying to protect other people from going through the heartbreak we've gone through.

"It's ripped our family apart. We're scared to get close to each other in case something happens to one of the other siblings.

"What he went though torments us all - how long he kept him alive, did he suffer? I could imagine my bother was petrified at what Leisk was doing to him.

"We need to know the truth. I think he put in a guilty plea so that the public didn't get to hear how evil and cunning he really is through a proper trial.

"If the parole board let him out, and he goes elsewhere, and he murders another child, I'm going to feel like we've let that child down, because we're doing everything we can to keep him in.

"Let Steven Leisk babysit the parole board's grandchildren and children, then they can think of releasing him if they feel he's safe to release into society, because he's a very dangerous man.

"He's taken a brother, a son, a grandson, a nephew, an uncle - he's taken Scott's whole life away from him, and he's taken Scott away from us" - SARAH WATT (Scott's sister)

Scott's mum is no longer alive, but before she died she wrote to Leisk in prison as she sought answers to questions surrounding her son's death.

She provided the offender with a list of questions.

Sarah, 39, explained: "My mum asked if her son suffered, and he said: 'I hope not. It took about 20-minutes for him to die.'

"Of course our brother suffered, he would have been petrified.

"The letter was very cold and calculating, and he signed it 'yours faithfully.' It's like he's not done anything wrong.

"He's taken a brother, a son, a grandson, a nephew, an uncle - he's taken Scott's whole life away from him, and he's taken Scott away from us.

"Mum kept everything - all his toys, all his clothes, his bed, his TV, all his videos - but she asked us to burn all Scott's belongings when she passed away.

"There were the clothes which Scott was murdered in which she slept with under her pillow every night for years, and she asked when she dies to have the clothes buried with her.

Charlene Clark, another of Scott's sisters is also desperate for answers. Breaking her silence since the tragedy, the 35-year-old she told us: "He will always be a monster. He's done sentences a few times, came out, and re-offended, and took it further this time by murdering an innocent little boy.

"We have no idea of what happened to Scott - when he actually died, what time he died. On Scott's gravestone it says July 1997 when he was murdered but there's no actual date - there's a space in the gravestone and it just looks wrong."

A decision on the violent criminal's freedom will be made on November 23rd.