Tests on the body of an MI6 worker from Anglesey found dead in a London flat have found no traces of suspicious substances.
Thirty-year-old Gareth Williams was found dead in a locked holdall in the bathroom of his flat in the Pimlico are of the city in August.
An initial post-mortem proved inconclusive as to cause of death and further toxicology tests were ordered.
No evidence of drugs, alcohol or poisons were found.
Police said a cause of death had still not been established and no further tests were planned.
Mr. Williams was discovered on the 23 August after police broke into his Pimlico flat when the alarm was raised by colleagues who had not seen him for “some time”.
He was last seen alive on 15 August, eight days before. Police have released CCTV footage of him entering Holland Park tube station in west London at about 15:00 the previous day.
Westminster coroner, Dr Paul Knapman, is due to review the case in private next Wednesday after opening an inquest on 1 September .