London, England (CNN) -- Metropolitan police in London, England, appealed Monday for further information about last month's death of a man who worked for a British intelligence agency and whose naked body was found in a padlocked duffel bag in his bathroom.
Police also released surveillance camera images of Gareth Williams taken August 15, about a week before officials discovered his body on August 23.
In addition, police said they would like help identifying "a man and a woman, both of Mediterranean appearance," between the ages of 20 and 30 and who were seen entering Wiliams' apartment building late one evening in June or July.
"This remains a complex unexplained death enquiry," Det. Chief Inspector Jacqueline Sebire said in a statement Monday.
Williams worked at Government Communications Headquarters (GCHQ), Britain's intelligence agency for monitoring communication and keeping government data secret, the agency told CNN. He was widely reported to have been on loan to MI6, the foreign intelligence service, in London.
The crime scene did not seem to reveal much information.
CNN
