A fearless investigative reporter who exposed the criminal underworld behind Northern Ireland’s paramilitaries, O’Hagan had made dangerous enemies on both sides, but no one has ever been convicted of his murder.
Joining Fionnán Sheehan on the  is Sunday World Northern editor Richard Sullivan and Irish Independent special correspondent Paul Williams, as they remember their friend and colleague and examine why, 25 years on, his killing remains unsolved.

The BelTel brings you some of Northern Ireland's top journalists, Allison Morris, Sam McBride and Suzanne Breen to name but a few, giving you the inside stories behind what is in the news. Presented by Ciarán Dunbar, the Bel Tel investigates, debates and informs every Monday, Wednesday and Friday.