Police investigating the unexplained slaying of a British intelligence official say tests on his body indicate no traces of drugs or poisons that may have led to his death.
Detectives are trying to establish how Gareth Williams, a 30-year-old official at Britain's eavesdropping and code-breaking agency GCHQ, died. Williams' naked and decomposing body was discovered inside a locked sports bag in his central London apartment on Aug. 23.
Police say Thursday toxicology tests show no evidence of any drugs, alcohol or poisons indicating the cause of death.
They have been hunting for a man and a woman seen calling at the communal door of Williams' apartment in June or July.
The death has sparked speculation and theories ranging from assassination to a sex game gone wrong.