Killer in the Family S01E03 - The Firestarter

Father of five Mohammed Riaz killed his wife and four daughters as well as himself in a house fire in Accrington, Lancashire.

His wife and daughters died while asleep that night, whilst Riaz died days later in hospital from his injuries. He had planned it all in detail, buying petrol cans which he set alight and pouring petrol throughout the house.

The apparent motive was disgust at his family's western lifestyle, including his wife's campaigning for women's rights and his children's less than strict adherence to Islam. Yet the post-mortem revealed Riaz was a hypocrite – a closet alcoholic with cirrhosis of the liver.