Killer in the Family S01E01 - The Family Annihilator

In July 2000, father of two Philip Austin murdered his wife Claire in their suburban home in Northampton. It was a brutal and premeditated assault with Austin using a mallet and two kitchen knives before ultimately strangling Claire with her own bra.

Next, this apparently mild-mannered family-man killed the family dogs, and then picked up his children Jade and Kieren from school. He took them for a long drive, stopping only for fish and chips, before tucking his children into bed back at home. Minutes later he strangled them both in their beds.

Just what causes a so-called family wipe-out like this? Why didn't those around Austin see it coming? And how can we stop it happening again?