A Jersey father who stabbed six people to death, including his wife and two young children, has been found guilty of their manslaughter.

Damian Rzeszowski took kitchen knives and stabbed his father-in-law Marek Gartska, 56, wife Izabela Rzeszowska, 30, daughter Kinga, five, and two-year-old son Kacper, in a frenzied attack at their home on August 14th 2011.

The 31-year-old also attacked his wife's friend, Marta De La Haye, 34, and her five-year-old daughter Julia, who were at the house for a barbecue.

Rzeszowski was convicted of six counts of manslaughter following a trial at the Royal Court in St Helier, Jersey.

The defence argued that Rzeszowski's marriage was struggling after his wife confessed to having an affair and threatened to kill herself.

Rzeszowski admitted the killings but his defence argued that he was suffering moderate to severe depression, causing an onset of psychotic symptoms.