The coroner investigating the death of MI6 spy Gareth Williams is to rule out unlawful killing as the cause of his death today.
Dr Fiona Wilcox will deliver the verdict on Wednesday afternoon, having presided over the week-long inquest into the mysterious death of the MI6 spy, who was found locked in a holdall in his bathroom.
Having heard all of the evidence, it is expected that Dr Wilcox will say that open and narrative verdicts are the only options available.
However, she added: "An open verdict would not do justice to the positive findings I can make."
Members of the high-flying codebreaker's family are expected to arrive at Westminster Coroner's Court before Dr Wilcox delivers her decision.
Relatives were moved to tears during the inquest as police, scientists and secret agents said his death remained a mystery.
Dr Wilcox angrily attacked police and MI6 yesterday for evidence disclosure failures surrounding belongings left at Mr Williams's desk.
Nine computer memory sticks and a black bag were overlooked in the inquiry until the lead detective, Jackie Sebire, was made aware this week.
Ms Sebire said Scotland Yard will review lines of inquiry in its investigation in the wake of the inquest.
But police - who have recovered no evidence of a third party being present when he died - have no suspects in their inquiry.
Ms Sebire said she remained convinced that Mr Williams's death was suspicious.
"Obviously a lot of information has come out through the course of this inquest which we have not been party to," she said.
She said Mr Williams was a "brilliant young man who spent his entire life working for his country and was commended for it".
Mr Williams, a 31-year-old fitness enthusiast originally from Anglesey, North Wales, was found naked, curled up in a padlocked holdall in the bath of his flat in Pimlico, central London, on 23 August, 2010.
Williams was found dead in a Government flat in Pimlico in August 2010.
After excelling at university at mathematics, Williams worked as a cipher and codes expert at the Government listening station, GCHQ.
Williams was then seconded to work at the Secret Intelligence Service headquarters in Vauxhall, London.
CCTV captures Williams entering Holland Road Tube Station on the 14th August 2010.
Caught on CCTV at Holland Road Tube Station the same day.
Seen the next day on CCTV in Hans Crescent, London
His body was found in a holdall in this Pimlico flat on the 24th of August 2010.
Williams' funeral was attended by Sir John Sawers, head of SIS.
Screengrab from a video reconstruction showing a yoga specialist trying to lock himself in a sports holdall unaided
Screengrab from a video reconstruction showing a person trying to close the zip and padlock themselves in a sports holdall unaided