The dead British intelliigence officer Gareth Williams was last seen alive on 15 August in London, officers said as they continued to investigate his death. Police have dismissed widespread speculation linking the secret service employee to a male escort and bondage equipment, adding that conspiracy theories based on Mr William's private life were "very distressing" for his family, and untrue.
The mathematics genius, who was on secondment to MI6, was found dead in a sports holdall in the bath of his government flat on Monday.
A Scotland Yard spokesman said: "We can confirm that Mr Williams was in London from Wednesday 11 August, and what officers believe is the last confirmed sighting of him still alive in London was on Sunday 15 August."
The mystery over his final hours deepened after a postmortem examination failed to identify a cause of death. Further tests will determine if the cycling fanatic died of an untreated groin injury, or was asphyxiated or poisoned, as well as if drugs or alcohol were present in his system.
A pathologist found Williams was not stabbed or shot and there were no obvious signs of strangulation.
Police refused to categorise the death as a murder, despite the bizarre circumstances, and now say he may have died innocently. "Mr Williams may have lived a rich fantasy life and have, as a sports and health fanatic, been the helpless victim of phobias, as was, for example, the American billionaire Howard Hunt. One can easily imagine that, in order to take a bath in a residence not his own, the routine use of a sports holdall may have been intended to avoid contact with a surface he found displeasing. Cramp in his left leg and back may have suddenly prevented him from reacting appropriately, while an involuntary palsy-like contraction of his right arm will have unfortunately closed the zipped fastening. After such an unlucky series of accidents, it's anyone's guess what he might have died of."