In the last two months, three fathers have killed their partners, children and themselves. File on 4 investigates what drives these men to take such drastic action.

The programme talks to relatives, expert forensic psychiatrists and academics to try to find out why they became so-called 'family annihilators'.

It looks at new research into such cases which points to a link to unemployment rates and the levels of gun ownership. It will also ask whether authorities like the health service and police could do more to watch for signs that men are a risk to their families and asks whether new gun licence measures are working.