In a “major development”, Scotland Yard have described Nathaniel Henry as a “significant suspect” in the murders of Noel and Marie Brown after being linked by forensic evidence.
However, officers have confirmed that the 37-year-old was found dead in a block of flats in southeast London on 31 December – a few weeks after the Browns’ bodies were discovered.
Henry had been reported missing by his family, and his death is being treated as non-suspicious.
Brown’s limbless body was found at his home in New Butt Lane, Deptford, south London on 4 December last year.
His 41-year-old daughter’s body was also found at his home, with detectives believing she was killed after walking in on her 69-year-old father’s murder.
Ms Brown, who had two children and was a creche worker, and her father were both strangled to death.
Met Police investigators were investigating whether Brown’s murder was linked to his 1999 conviction for a child sex offence, having been released in 2004.
Following the killings in December, police released CCTV images of a suspect who is believed to have visited Brown’s flat at least four times between his death and the bodies being found.
It is not clear if Henry is the man wearing a backpack in the footage.
Detective Chief Inspector Simon Harding said he had “not seen anything quite like” the two murders in his 27 years of policing.
Police in December played down speculation that Brown may have been murdered after a big win at a Paddy Power bookmakers in Deptford High Street on 30 November, the last day he was known to be alive.
Police are still investigating the two deaths and carried out searches of several properties in the Southwark and Lewisham area in the week of 30 April.
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Detectives are now asking members of the public to help them piece together Henry’s final movements.
:: Anybody with information should contact the police incident number on 0208 721 4205, or 101 or by calling Crimestoppers anonymously on 0800 555 111.