'Until I Kill You' tells the story of a woman who survived the so-called 'Scalp Hunter' killer. Here's what happened to them.

• "Until I Kill You" is about Delia Balmer's relationship with the so-called Scalp Hunter killer, John Sweeney.
• Balmer dated Sweeney during the 1990s before he tried to kill her.

"Until I Kill You" tells the story of a nurse who survived being attacked by her ex-boyfriend, a serial killer known as the "Scalp Hunter."

The show is the latest in a string of true crime shows and podcasts, in a boom started by Netflix's 2015 documentary "Making a Murderer."

In "Until I Kill You," viewers observe John Sweeney (Shaun Evans) through the eyes of his ex-girlfriend, Delia Balmer (Anna Maxwell Martin). It's adapted from Balmer's book "Living With a Serial Killer," which charts her relationship with Sweeney.

The show started airing on the British network ITV in November. US viewers can stream it on BritBox from November 13.

The network also released a documentary, "Until I Kill You: The Real Story," which includes interviews with Balmer about her ordeal.

Here's what happened to Balmer and Sweeney.

John Sweeney was convicted for killing two women in 1990 and 2001.

As seen in the series, which is based on Balmer's book, Sweeney and Balmer started dating in the early 1990s. He attacked her at her home when the relationship started to break down.

During the assault, he confessed to her that he murdered his ex-girlfriend, Melissa Halstead, 33, in Amsterdam. Police had discovered Halstead's dismembered body in a Rotterdam canal in 1990.

Police arrested Sweeney for assaulting Balmer but he was released on bail. A few months later, in December 1994, he attacked Balmer at her home with an axe and cut her finger off, before a neighbor stepped in to defend her.

Sweeney went on the run and remained at large for six years until February 2001. Police arrested him in London and he was given four life sentences for attempting to kill Balmer.

He was serving those sentences at Gartree Prison in Leicestershire when police arrested him in 2010. He was linked to both Halstead's killing and the death of Paula Fields, 31, whose body parts were found in Regent's Canal, Camden, in 2001.

During a search of his London home, the authorities found 300 pieces of art depicting extreme violence, and a poem titled "Scalp Hunter," which, The Guardian reported, referred to Halstead's death.

It read: "Poor old Melissa, chopped her up in bits, food to feed the fish, Am*dam was the pits."

The BBC reported that the authorities also suspected that Sweeney was involved in the disappearances of three other women, including one from the late 1970s or early 1980s — but it's unknown whether she was killed or left to work in Switzerland. Two of Sweeney's other ex-girlfriends also have not been seen since he went on the run in the late 1990s.

In 2011, Sweeney was sentenced to life in prison for murdering Halstead and Fields. Mr Justice Saunders, the judge presiding over the case, said during the sentencing: "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.

"Not only does it reveal the cold-blooded nature of the killer, but it has added greatly to the distress of the families to know that parts of the bodies of their loved ones have never been recovered."

Delia Balmer survived being attacked by John Sweeney.

Balmer survived both attacks by Sweeney and went on to write the 2017 book "Until I Kill You" is an adaptation of. She also appeared in the documentary that accompanied the TV series.

In it, Balmer explained that she has loved dancing since she was a child and continues to attend dance classes.

She said: "I was very quiet and shy, didn't have proper friends, and I was scared of kids. My mum took me to the ballet and I've always danced when I could. If I travel and there's music, I'll dance. I am a perfectionist, but my life is the opposite of perfect."

Toward the end of the documentary, Balmer explained how her experiences with Sweeney changed her.

She said: "I'm an angry person and I've been very bitter, and I'm still quite bitter. I don't like the damage done to this body. It need not have happened."