The teenager was killed after being lured to Linear Park, Culcheth, a village near Warrington, Cheshire on February 11, 2023.
She was stabbed with a hunting knife 28 times in her head, neck, chest and back by teenagers Scarlett Jenkinson and Eddie Ratcliffe.
The documentary will feature interviews with the victim’s friends and family as well as detectives.
A documentary about Brianna Ghey’s murder will air this evening (Image: PA) Brianna Ghey’s mother, Esther, will also be part of the documentary because she wanted “to ensure that my family’s story was told truthfully”.
She said it would also be an opportunity for people “to know Brianna the way we did”.
Esther Ghey is calling for a public inquiry into peer-on-peer violence, will speak in-depth about her 16-year-old daughter, whose murder led to UK-wide protests and vigils.
Scarlett Jenkinson and Eddie Ratcliffe have been jailed for the murder of Brianna Ghey (Image: Cheshire Police) It was revealed that from the age of 14, Jenkinson enjoyed watching videos of real killings and torture on the dark web, fantasised about murder and developed an interest in serial killers.
How to watch Brianna Ghey documentary
The ITV documentary, Brianna: A Mother’s Story, will be broadcast on ITV1 and ITVX on Thursday, March 27 at 9pm.
Cheshire Police has given access to its investigation, including evidence and custody suite interviews with the two killers, who were caught within 28 hours.
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Tom Giles, controller of current affairs at ITV, said: “We are incredibly grateful that Brianna’s family entrusted us and (television production company) MultiStory Media to bring this deeply personal story to ITV.
“We are privileged to have had the unique insight of Esther – as well as of the police force who worked on the case.
“The resulting documentary is a testament to the strength of character of Esther who, in the face of such an appalling crime, fights to this day to effect real change in society and to keep her daughter’s name alive.”