A man whose wife and four daughters were killed in an arson attack on their home has died in hospital, Lancashire Police said today.
Mohammed Riaz died in Wythenshawe Hospital, Manchester, at 8.33am today.
Detectives said he was their only suspect in the murder investigation into the cause of the blaze in Accrington, which they say was "contained within the house".
A police spokesman said: "Police are not looking for anyone else in connection with their investigation."
Caneze Riaz, 39, and her daughters Sayrah, 16, Sophia, 15, Alicia, 10, and three-year-old Hannah were found dead in their beds by firefighters in the early hours of Wednesday morning.
Mr Riaz was pulled to safety but suffered 50% burns to his body.
The children, described by neighbours as "little angels", had been enjoying a Halloween night party just hours before the fire.
Last night it emerged that Mr and Mrs Riaz, who had an arranged marriage 20 years ago, might have been having marital problems.
Mixed-race Mrs Riaz is thought to have grown apart from her strict Muslim husband.
She left Mr Riaz at the family home to go out with another Asian man on Tuesday evening, hours before she was killed in the blaze.
They had visited her son Adam, 17, ill in hospital with leukaemia, before the two had dinner in Manchester, according to sources.
But after her friend and colleague dropped her off at the family home, the house was locked up and torched from the inside using accelerants.
Before Mr Riaz died, officers were waiting at his hospital bedside to question him.
Police confirmed they were exploring a possible marriage breakdown between the couple.
Detective Superintendent Mick Gradwell, leading the murder inquiry, said last night: "We are now investigating a line of inquiry that there has been a breakdown in the relationship between Caneze and Mohammed Riaz."
Mrs Riaz, described as bubbly and popular, had been extremely active in the local area and was described as a "pillar of the community".
Her husband worked in a plastic factory and was 10 years her senior. He was from the North West Frontier region of Pakistan, a strictly Muslim and deeply conservative area bordering Afghanistan.
He has been described by neighbours as a "good family man" who was very quiet and did not socialise other than at his local mosque.
One possible motive police have not discounted is that the murders were an "honour killing" - when a person is killed by relatives for allegedly disgracing the family name.
Yesterday, prayers were said for the family by friends of the girls gathered at school assemblies.
Dozens of floral tributes have been left outside the house by a community "staggered" at the murders of a popular family.
One was signed by the elder girls' schoolfriends and said: "We love you all. Best wishes to Dad and Adam."
Post-mortem examinations have confirmed Mrs Riaz and the girls died in their beds as a result of smoke inhalation.
A post-mortem will be carried out on Mr Riaz.Reuse content