A Coroner has ruled that former Leicestershire Police Inspector Toby Day unlawfully killed his wife Samantha and their six-year-old daughter Genevieve before killing himself at their family home in Robin Crescent, Melton Mowbray.
The attack took place just days after Mr Day, 37, was sacked from Leicestershire Police for misconduct.
The inquest in Loughborough heard how Toby Day punched wife Samantha, 38, in the face before strangling and stabbing her in the chest and stomach last December.
He then strangled and stabbed their six-year-old daughter before turning the knife on himself.
Armed police forced their way into the house and found the bodies of Samantha and Genevieve on a double bed in a back bedroom in the property in Robin Crescent, the inquest heard.
The former inspector was found on the floor next to them, with a kitchen knife in his hand.
The couple's surviving children were also injured in the attack and were present at the inquest today, fourteen-year-old Adam, and sixteen-year-old Kimberley, spending ten days in hospital.