John Sweeney is currently serving a life sentence after he was convicted of two murders and his son has spoken out about the moment he showed him a chilling drawing

Until I Kill You is a new ITV drama inspired by the memoir of John Sweeney's only known surviving victim, Delia Balmer, who discovered a hoard of disturbing drawings

The series is inspired by the 2017 memoir, Living with a Serial Killer, and is accompanied by a new documentary which details the true timeline of events.

Melissa Halstead and Paula Fields were John Sweeney's two known victims whom the axe murderer disposed of in different canals.

Serial killer John Sweeney murdered two women and the true crime drama Until I Kill You delves into their stories as well as that of his ex-girlfriend and surviving victim Delia Balmer

ITV's new drama, Until I Kill You, is based on real-life events and was adapted from Delia's book Living with a Serial Killer

WARNING: Graphic content. The ITV series, Until I Kill You, is based on the memoir of Delia Balmer, Sweeney's ex-partner who he attacked with an axe before fleeing

Until I Kill You is airing on ITV and it explores how serial killer John Sweeney's artwork would eventually lead to his conviction.

Until I Kill You on ITV is based on the memoir of Delia Balmer, the only known surviving victim of serial killer John Sweeney

The first episode of ITV's new true crime drama Until I Kill You will air this week

John Sweeney is a former carpenter who is serving life in prison after being found guilty of the murders of two women, Melissa Halstead and Paula Fields

Delia Balmer was subjected to a brutal and sustained attack by axe murderer John Sweeney in 1994 and still suffers from the impact of the assault to this day

Viewers of ITV's new true crime series Until I Kill You were left horrified by John Sweeney's attack

John Sweeney was a brutal killer who murdered two women and left his ex-girlfriend, Delia Balmer, for dead after attacking her with an axe and knife outside her home

Until I Kill You continues on ITV this week and the series is based on Delia Balmer's memoir titled Living With A Serial Killer

John Sweeney, who is played by Shaun Evans in ITV's harrowing drama, was a serial killer who murdered two women

'Cold Case: Who Killed JonBenét Ramsey' docuseries traces six-year-old JonBenét's murder case.

New ITV drama 'Until I Kill You' shows how John Sweeney hid his murderous past while tormenting his then partner Delia Balmer - before trying to kill her as well

Until I Kill You is based on Delia Balmer's memoir titled Living With A Serial Killer.