Shianne Treanor said she will never forgive her mum for her disgusting acts

FREE now SUBSCRIBE Invalid email Make the most of your money by signing up to our newsletter fornow We will use your email address only for sending you newsletters. Please see our Privacy Notice for details of your data protection rights.

Shianne Treanor revealed how she confronted her mother in jail to demand answers over why she carried out the sadistic murders of three men - and tried to kill two more. Shianne was only 13 when she discovered that her mother was a triple murderer who tortured one of her victims to death and left her victims for dead in a ditch. She learned the truth when she received a phone call at a sleepover. For years Shianne tried to understand how Dennehy went from a loving parent to a man-hating killer hooked on drugs and alcohol. Now, speaking for the first time, Shianne has told of the moment she sat down opposite the murderer in HMP Bronzefield, where she is serving a whole life sentence, to demand answers. Dennehy told a court before she was sentenced in 2014 that she was "sorry" for the attempted murders but "not sorry for the murders". Shianne, now 19 and living in Manchester, says: "I'm sorry for the victims - I can't imagine what they went through. I can't believe she did what she did. It makes me want to cry. She's hurt those people and I can't ever forgive her for that.

"In a way she's completely ruined my life. Now I've got this family name associated with the fact she's taken lives. "When Myra Hindley was arrested they never found out where the bodies were because she never gave anything up. In a way, because my mum hasn't said anything, or given an explanation, those families will never understand. "I can't get my head around it. I think she should explain why she did what she did - those families deserve peace of mind. "They should have a reason as to why they are in the dark." Dennehy, a diagnosed psychopath, became one of only three women to be told she will never be freed from jail after she was given a whole-life term in 2014.

Shianne with murderous mother Joanna

Two men, Gary Richards, 47, and Leslie Layton, 36, who were "under her spell", were convicted of being her accomplices in the frenzied knife attacks. In Peterborough, Dennehy murdered her lover and married father-of-two Kevin Lee, 48, Lukasz Slaboszewski, 31, and John Chapman, 56, whith whom she shared a bedsit, all during a 10-day period. All her victims were knifed in the heart and Slaboszewski's body was dumped in a wheelie bin. After the killings, she drove more than 140 miles to Hereford where she knifed two other men, Robin Bereza and John Rogers, to satisfy her urges.They both survived. Dennehy, of Peterborough, Cambridgeshire, admitted to a psychiatrist that she killed because "it got moreish and I got a taste for it". When she learned of her mother's rampage, terrified Shianne told how she feared she would inherit her appetite for murder.

Dennehy posing with a knife as her life descended into chaos

Aged 13, she asked her father: "Will I turn out like Mum?" Shianne, who completed a travel and tourism course at Tameside College last year, says: "It was a genuine thought. I was only 13 and I didn't know if it was a genetic thing. I was only a kid." Last night Shianne told how Dennehy had played lovingly with her as a child. But when her relationship with partner John Treanor, 42, deteriorated, her life descended into a spiral of drugs and chaos. Shianne says: "My mum would love to read. She was always on the sofa reading a book and she would go out on long walks. "She loved Mr Darcy, she read Pride And Prejudice. She loved that book. She would talk to me about it all the time.

John Chapman was one of Dennehy's victims

"She'd do papier-mâché art with me and my friends. In the summer Mum would get the paddling pool out and we'd do somersaults into it and make mud pies. She was just a really big kid." Dennehy gave birth to Shianne when she was only 17. But a second child three years later sent her on a long, downward path. In 2009, when Shianne was nine, John took the two children from the family home and moved to Glossop, Derbyshire, after Dennehy pulled a 6in knife from her boot and stabbed it into the floor. Speaking about her mother's changing personality, Shianne says: "My mum would just come home after being away for so long and she would have a black eye from a fight. She'd disappear for days on end, sometimes for months. "She would come home and she would have cuts all over her or she'd been cheating and she'd have love bites and she'd have to hide it with a scarf.

Lukasz Slaboszewski was also murdered by Joanna

"They would have massive arguments, I don't know what about, but they'd be screaming at each other for hours and hours and hours." Shianne had not seen her mother for nearly four years when she learned that she had become one of Britain's worst female serial killers. The news sent her into a fit of depression and she was forced to move schools when her friends discovered what had happened. She had nightmares, her grades suffered and she spent her teenage years completely "in the dark" until she was able to confront her mother. But now - after meeting her in jail - she has turned her life around and vowed never to end up like her. She made contact with Dennehy last October and the pair had what turned out to be an emotional reunion in the prison, just off the M25 near Heathrow airport.

Kevin Lee also fell victim to Dennehy's crimes

She says: "I was told nothing about my mum and I wanted answers. "I've always said I wanted to see my mum but it was always shut down. I wanted answers and I wasn't getting them. "I turned 18 and started to look into it. Eventually I got an email telling me where she was. "In October I wrote her a letter. I was really cold because I thought she hated me. I told her I wasn't looking for a relationship but I wanted to know why. But I got a letter full of love and warmth and how much she wanted to have me in her life. I just cried, it was so emotional." Reliving that meeting, she said: "I was nervous, it was even nerve wracking for the prison.

"I was picked up from the station by security guards and escorted back. I was shaking. "When I got into the visit hall I had to take a double look when I saw her - she looks completely different. "We were the only people in the room apart from the guards.We sat opposite each other at a table, she was wearing a black T-shirt, blue jeans and some boots. "She looked completely different. She's got short blonde hair and piercings on her face, one next to her eye. Nothing will ever justify what she had done, I hate what she did and that she hurt people." She adds: "I will never turn out like my mum. I'm my own person. She gave birth to me and I might have some personality traits of hers but we're two different people.

Shianne used to be terrified of turning out like her murderous mother