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.
One of Britain's most senior spies apologised to Gareth Williams' family today for the mix-up which saw MI6 fail to report his disappearance for a week.
Sir John Sawers, chief of the Secret Intelligence Service, expressed the "deepest condolences" of MI6 and GCHQ for the death.
In a statement delivered by MI6 lawyer Andrew O'Connor, Sir John said the service should have acted more swiftly when Mr Williams failed to turn up to work in August 2010.
Mr O'Connor said: "On behalf of the whole organisation, Sir John regrets this deeply and apologises unreservedly."
On balance of probabilities, coroner agrees with family that Gareth was unlawfully killed - though that's not the actual verdict #spook
Coroner thanks DCI Jackie Sebire who is leading police inquiry and gives her sympathies to Gareth's family #spook
MI6 barrister on his feet says chief John Sawers recognises "anguish" delay in finding Gareth causes his family an apologies "unreservedly"
Coroner says "beyond belief" Gareth could have arranged the lock and zips so neatly from the inside #spook
Coroner thinks whoever was in flat either knew Gareth v well or was uninvited #spook
On balance of prob bag was locked by a 3 rd party - coroner suggesting the wiped iPhone could have been used to arrange the meeting #spook
Coroner says on balance of prob Gareth entered the bag alive and died from hypercapnia or unknown poison #spook
Either way it's unnatural causes , coroner says #spook
Coroner also says she 's satisfied bag was placed in bath by a third party prob to conceal decay of body and leakage #spook
Coroner says women's clothes too small for Gareth to wear, could have been presents, lack of underwear 'inconsistent' with transvestitism
No evidence to support idea Gareth was a transvestite or gay - friends evidence goes against that completely #spook
His interest in drag acts more likely to be interest in comedy #spook
The coroner ruled out Mr Williams's interest in bondage and drag queens in having any bearing on his death.
Instead, she questioned leaks about his private life to the press.
She said: "I wonder if this was an attempt by some third party to manipulate the evidence."
The coroner suggests that inaccurate reporting of Gareth Williams' personal life was an attempt by a third party to manipulate perceptions of the case.
The coroner says it is "highly unlikely" Gareth got into the red bag alone in the bath - there should have been foot and fingerprints in the vicinity.
Coroner Dr Fiona Wilcox revealed the extent of the police investigation into the death of MI6 agent Gareth Williams, while delivering a narrative verdict.
Police interviewed more than 200 witnesses.
110 CCTV clips were collected.
300 house to house inquiries were conducted.
During the narrative verdict, Coroner Dr Fiona Wilcox says two keys to the padlock were found under Gareth's body, two others were locked in a cash box
She adds it is "highly significant" none of Gareth's fingerprints were found on the tiles or the shower screen near the bag.