Whatever the coroner's verdict today at the inquest into the death of MI6 spy Gareth Williams, many questions will remain unanswered.
Last day of the inquest into the death of Gareth Williams
Experts can't rule out the possibility that the MI6 spy found dead in a bag, locked himself in unaided, before dying.
The coroner, overseeing the death of MI6 spy Gareth Williams, has suggested that "an open verdict would not do justice to the positive findings that I can make" and that "a narrative verdict would be the most appropriate".
Dr Fiona Wilcox is expected to deliver full verdict at about 11.30am.
The coroner says the only options in this case are an open verdict or a narrative verdict, which is her preferred option. She says she will be making observations about the "reliability and robustness" of the evidence heard at the inquest.
The coroner in the inquest into the death of Gareth Williams is due to deliver a verdict today.
The MI6 spy was found in a bag in his Pimlico flat in August 2010.
The Inquest is being held by Dr Fiona Wilcox at Westminster Coroner's Court.
MI6 spy Gareth Williams would have suffocated within three minutes after getting inside his sports holdall, an inquest heard today.
Poisoning and asphyxiation are the "foremost contenders" in solving the death riddle, pathologists said.
It also emerged scientists found traces of "at least" two unknown people in his apartment despite evidence Mr Williams rarely invited people over.
Forensic expert Ros Hammond said there were hopes of a breakthrough "within a matter of weeks" from DNA tests found on a green towel in his kitchen.
"There's hope," she told Westminster Coroner's Court. "The tests are still in progress and there may be some promising results from those tests."
Ms Hammond said a third party would not necessarily have left any DNA on his red North Face bag and padlock.
Poisoning and asphyxiation are the "foremost contenders" in the sports bag death riddle of MI6 spy Gareth Williams, the inquest heard.Mr Williams was probably suffocated or killed by a poison which disappeared in his system during decomposition, pathologist Benjamin Swift said.
Dr Swift said his post-mortem examination was hampered by levels of heat within the bag after radiators were turned on in Mr Williams's top floor flat in the middle of summer.
Examinations on August 25 2010 - two days after Mr Williams was found in a holdall in his bathroom - gave cause of death as "unascertained"