Four people held over the 1997 murder of a Northern Ireland GAA official have been freed pending further inquiries.
Sean Brown's body was found in a burned out car
Sean Brown, 61, was shot as he left his local Gaelic Athletic Association (GAA) club in Bellaghy, County Londonderry.
In a series of arrests on Wednesday and Thursday in Nuneaton, Warwickshire, a 44-year-old man, and two women, aged 39 and 45, were questioned then freed.
A man, 31, from Brentwood, Essex, was also arrested and released. All four are originally from Northern Ireland.
The murder of Mr Brown was featured in a reconstruction by the BBC's Crimewatch programme in June.
A GAA match was recreated for the programme, and poet Seamus Heaney and Church of Ireland primate Archbishop Robin Eames were interviewed.
Last year Sean Brown's family reached agreement with PSNI Chief Constable Hugh Orde on how a new investigation should proceed.
It followed a critical report from the police ombudsman on the original Royal Ulster Constabulary (RUC) investigation into Mr Brown's death.
In January 2004, Police Ombudsman Nuala O'Loan said she had upheld two complaints from Mr Brown's family about the RUC inquiry into his murder.
A new team of investigators, including officers from outside forces, started a new inquiry.