Robert McCartney, a 33-year-old father, was killed in 2005 after a confrontation inside Magennis' Bar in Belfast escalated into gang violence, as Belfast Live reports.

A new three-part BBC documentary, Murder in Belfast: Sisters Seeking Justice, produced in association with RTÉ and directed by John O'Kane, tells their story, with all episodes available now on BBC iPlayer ahead of television broadcasts on BBC One NI, RTÉ One and BBC Two.

The documentary's most significant contribution, according to Love Ballymena, is an on-camera account from Brendan Devine, the survivor of the violence, who describes for the first time the events leading to McCartney's murder.

A police insider describes how the IRA allegedly cleaned up the scene and seized video evidence, while dozens of people inside the bar claimed to have witnessed nothing despite the violent events unfolding around them.

Viewers will also see police video footage of the scene made public for the first time, alongside new testimony from political figures drawn into the family's campaign.

The sisters' search for answers was absorbed into politics as their campaign gained momentum, taking them from Belfast to the White House.

Belfast Live reports the series hears from former Taoiseach Bertie Ahern and from Mitchell Reiss, the American envoy who brought the sisters to the White House and recognised that the fallout from the killing could be used as leverage to push the IRA to disarm.

Love Ballymena notes the campaign connected the family's demand for justice with wider efforts in Northern Ireland's peace process, turning a working-class family's grief into international diplomacy.

After the international spotlight faded, the men accused in connection with the killing stood trial — and all were found not guilty, leaving the family without any conviction for McCartney's death.

In the final episode the sisters reflect on what they believe the campaign achieved, how their loyalties and beliefs were tested, and the trial's aftermath.