Sian Blake played Frankie Pierre in the BBC One soap between 1996 and 1997
The Independent Police Complaints Commission is investigating the police response to concerns raised about the welfare of former actress Sian Blake and her two children.
The bodies of the ex-EastEnders star and her sons, Zachary and Amon, were found at the family home on Tuesday.
Concerns about Ms Blake's welfare were passed to the Met police before it launched its missing persons inquiry.
The IPCC promised it would conduct "a thorough investigation".
A missing persons probe was launched on 16 December after officers attended the family's home in Erith.
This was undertaken following information from the children's charity, the NSPCC, over concerns about Ms Blake's welfare, police said.
'Head and neck injuries'
Remains found in the garden of the family's home in Erith, south-east London, were confirmed on Thursday as those of Sian Blake, 43, and her sons Zachary Bilal Kent-Blake, eight, and Amon Ben George Kent-Blake, four.
Zachary (left), aged eight, and Amon, aged four, went missing with their mother last month
Ms Blake and her sons were last seen in December
A police spokesperson said they all died from head and neck injuries.
Ms Blake's partner is being sought by police over the deaths.
However, the BBC understands Arthur Simpson-Kent, 48, has left the UK and travelled to Ghana.
Ms Blake and the couple's sons had not been seen since 13 December. They were reported missing three days later.
The case is now being treated as a triple murder inquiry.
Timeline
13 December: Sian Blake is last seen in Waltham Forest, east London, with her sons Zachary, eight, and Amon, four.
16 December: Police visit her home in Erith and speak to Mr Simpson-Kent. This is the last time he is seen.
3 January: Miss Blake's car is found in Bethnal Green, east London
5 January: Bodies found at her home in Erith
6 January: Mr Simpson-Kent is thought to have travelled to Ghana
8 January: Sian Blake and her two sons are confirmed dead
Forensic specialists were later called in to search the family home and the bodies were found during excavations in the garden on Tuesday.
Significant attempts had been made to conceal the bodies, police said.
Arthur Simpson-Kent, pictured with son Amon, was last seen on 16 December
Det Supt Paul Monk, from the Met's Homicide and Major Crime Command, said the police were "continuing to appeal for any information about the movements of Arthur Simpson-Kent".
Ava Blake, Ms Blake's sister, has claimed the former EastEnders star had previously said she wanted to leave her boyfriend.
Sian Blake, who had motor neurone disease, played Frankie Pierre in the BBC One soap between 1996 and 1997.Probe into police after actress murder
The Met referred its handling of the case to the IPCC earlier this week. It has now been confirmed the watchdog will proceed with an investigation.
IPCC Associate Commissioner Tom Milsom said: "The loss of Sian and her two young boys, Zachary and Amon, is a tragedy and my thoughts are with their family during this very difficult time.
"The IPCC will be conducting a thorough investigation into how police responded to the concerns for their welfare and their disappearance."
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