A dad is thought to have lived with the bodies of his three-year-old son and wife for up to two weeks after allegedly murdering them.
Police said mum Poorna Kaameshwari Sivaraj, 36, and her son Kailash Kuha Raj had not been heard from or seen since September 21 and they had been dead for “some time”.
Their bodies were discovered when police broke down the door of the family’s fourth-floor flat in Brentford, west London, just before 1am on Tuesday.
It is thought Mrs Sivaraj’s husband, Kuha Raj Sithamparanathan, 42, fatally stabbed himself as officers forced their way in, according to detectives probing the suspected double murder-suicide.
His wife and son were already dead, and their pet dog, a cockapoo which they took on regular walks up until last month, had been killed.
Kuha was treated by police and paramedics for his stab wounds, but died at the scene.
Police are not looking for anyone else in connection with the deaths, as local residents say the couple had been rowing and having problems during the Covid-19 lockdown.
They claim they heard Poorna yelling at Kuha to “take his medicine”, and he had once thrown his medication out of a window.
Post-mortem examinations are due to take place on Thursday.
Officers broke into the family’s flat after concerns were raised for Poorna and Kailash’s welfare.
Police initially received a call late on Sunday from a family member who was worried about Poorna.
Officers visited the home “several times” in the early hours of Monday, but left on each occasion after no one answered the door.
After speaking to neighbours on Monday, “concerns heightened” and police made the decision to force their way in.
There, they found the bodies of the mother and son, and tried to save the father, who had stab wounds.
Poorna and Kuha were born in Malaysia and got married in Kuala Lumpur in 2015.
A neighbour, who lives on the fifth floor, told MailOnline: “During the lockdown I could hear them arguing a lot.
“I could hear her screaming at her husband, telling him to take his medicine. Then on another occasion, he threw them out of the window, and I looked down and could see them on the ground.”
Another neighbour added: “Things got really bad between them, especially during the lockdown.”
That neighbour, who lives on the sixth floor, claims the couple were heard screaming at each other, sometimes for long periods, and Poorna once threw her husband’s belongings out of a window and told him to take his medicine.
Fahad Alsharamy, who lives next door, told the Evening Standard: “In lockdown they fought a bit but it’s normal for families but for one week it has been very quiet. I’d spoken to them and they were friendly.”
Jamila, who lives in a neighbouring block, told the Sun: “It’s tragic. They loved their dog and I’d see them all the time taking him out for walks.”
Sheri Diba, who also lives in the block, said the family were “very friendly” and she used to regularly see them taking their dog for walks.
She added: “I’ve always seen them in the lift. They were very friendly. They said ‘Hi, how are you?’ I always saw them together going for walks.
“I feel really bad (hearing the news) because they were very friendly, nice people.”
Ms Diba, a mother of one, said she had lived in the building for seven years and described it as a “nice area”, but said she had not seen the family for a number of months.
Devastated friends have paid tribute to Poorna and her son.
One wrote on Facebook : “Gone too soon. Rest In Peace Poorna and baby Kailash.”
The investigation into the deaths continues.
Met Police Detective Chief Inspector Simon Harding said: “Although we are in the infancy of this investigation is appears that Poorna and Kailash had been dead for some time.
“This is a murder investigation and my team will work diligently to establish the sequence of events that led to their murders and the death of Kuha Raj Sithamparanathan.
“Our initial enquiries have established that Poorna and Kailash had not been seen or heard from for some time, perhaps since around the 21 September.
“We know the family often walked their dog, a poodle cross breed, in and around the local area and I would ask anyone who saw them at any time in the last month to contact police so we can begin to build a full picture of their lives.
“I know I speak on behalf of all the officers in my team that words cannot sufficiently sum up the devastation that this horrific incident will have on the families of those involved. However, I can reassure them that we will do all we can to provide them with the answers they need about what has happened here.”
A spokesperson added: “Police initially received a call late on Sunday, 4 October from a family member raising concerns about the welfare of Poorna.
“Officers attended the address several times in the early hours of Monday, 5 October but received no reply. From talking to neighbours as the day progressed, concerns heightened and a decision was made to force entry.
“The Directorate of Professional Standards has made a referral to the Independent Office for Police Conduct as it is believed the Kuha Raj Sithamparanathan fatally injured himself when officers entered the property.
“This meets the criteria of a mandatory referral.”