ITV Until I Kill You: Tragic truth behind Delia Balmer and fate of serial killer John Sweeney

viewers cannot stop watching the channel's addictive new drama , which is harrowingly based on real-life events.

The series is set in 1991 and tells the tale of agency nurse Delia Balmer, played to perfection by , who finds romance with John Sweeney (Shaun Evans). After meeting in a pub in Camden, North , Delia believes she's found a fellow "free spirit" in the carpenter and casual labourer.

At first Sweeney is an attentive boyfriend, treating her to bunches of flowers, but behind the kind gestures lies pure terror. For little does Delia know, Sweeney is a dangerous killer who one day will turn his gaze onto her. Her tragic tale is now explored tonight in ITV's Until I Kill You: The Real Story, narrated by Maxwell Martin.

The documentary explores the stories of Sweeney's known victims, including American model Melissa Halstead and mother-of-three Paula Fields, and reveals the grisly details of how he dismembered their bodies and disposed of their remains. In her 2017 book , which has helped inform the series, Delia recalled: "Subtle changes happened slowly. I should've known something was wrong but I am too soft and trusting. I'd never come across anything like it before."

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Squatter Sweeney ended up moving into Delia's home, and she soon became alarmed by his furious temper, while his behaviour soon became controlling and abusive. Living in terror, it took Delia years to pluck up the courage to ask Sweeney to leave - and he reacted with shocking cruelty.

Although she'd first asked him to leave in December 2023, Sweeney continued to manipulate Delia, with his abusive behaviour escalating sharply in the spring of 1994. Over the course of several days, Sweeney held Delia captive in her own home, keeping her restrained to the bed, and threatening to mutilate her tongue if she screamed.

It was during this nightmare ordeal that Sweeney confessed to the murder of his ex-girlfriend, the model and photographer Melissa Halstead, whose remains were recovered from a Rotterdam canal in 1990. Remembering Sweeney's chilling words in her book, Delia wrote: "We had a room in Amsterdam. I went in. There were two Germans there with her. I killed them all. I didn't know what to do with the bodies. I sat with them for three days. On the third day, I cut them up, and I put them in bags and I threw them in the canal."

Fearing for her life, Delia was careful not to rouse Sweeney's anger further - and he eventually freed her. Delia reflected: "He was very quick, and if I had tried anything, I probably would have ended up cut up." Unfortunately, this wasn't the end of the story for Delia, and Sweeney continued to hound her, carrying out multiple vicious attacks that culminated in a savage axe rampage that left Delia with severe injuries.

Sweeney fled the scene and managed to evade police detection for years, during which time he targeted and murdered mum-of-three Paula Fields in 2000, tossing her body into London's Regent’s Canal. In 2001, he was finally caught and arrested, and given a nine-year custodial sentence against Delia.

While serving time at Leicestershire's Gartree Prison for the attack on Delia, Sweeney was also questioned about Melissa and Paula, with officers suspecting a connection. Eventually, advances in DNA on top of Delia's testimony, helped authorities build a case against evil Sweeney, and put him away for good.

After being found guilty of killing both women, Sweeney was sentenced to life imprisonment in 2011 without the possibility of parole and remains incarcerated. Horrifyingly, as reported by the , it's believed Sweeney could have killed three other women who were reported missing between the years 1970 and 1990.

Sweeney refused to leave his prison cell at Belmarsh prison as his sentence was handed down. Judge Mr Justice Saunders, sentencing him, told the court at the time: "These were terrible, wicked crimes. The heads of the victims having been removed, it is impossible to be certain how they were killed.

"The mutilation of the bodies is a serious aggravating feature of the murders."

Delia was involved in the making of Until I Kill You, and offered critiques of the draft script penned by writer Nick Stevens. Speaking with ahead of the series being aired, Delia shared: "When I wrote my original story, I included every detail of what happened. When it came to the final attack on the doorstep, I edited it over and over again, wanting everything to read precisely as it had happened.

"My concern has always been to get the truth out by whatever means. I remain an angry person. Sweeney was let out on bail. The police gave me insufficient protection before his final assault. Later, I was forced to go to court to be further traumatised by the system."

Although Delia has managed to rebuild her life in the aftermath of her trauma, her ordeal still affects her to this day. She explained: "I often suffer from depression and anxiety, afraid of life and afraid of the future, a compulsive worrier.

"When I look in the mirror I see a stranger. Certain physical pain, I will have for life. I am stuck. I cannot move on, and cannot go further. Fear holds me back from doing certain things. I live for travel, but it is has also become almost my only escape from reality. Ballet classes have always been an important part of my life."

The national domestic abuse helpline offers support for women on 0808 2000 247, or you can visit the website. There is a dedicated on 0808 8010 327. Those in the US can call the domestic violence hotline on 1-800-799-SAFE (7233). Other international helplines can be found via

You can catch Until I Kill You: The Real Story this evening (November 7) at 9pm on ITV1.

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