Journalist Martin O'Hagan was murdered in 2001. His killers have never been caught. Stephen Dempster investigates allegations that security force informers were involved and are being protected.

In public, David Tweed was well known as an Ulster and Ireland rugby star turned politician. But in private, his children and ex-wife say he was an abuser. In their first televised interview as a family, they tell Lyndsey Telford that they suffered years of years of physical and sexual abuse.