Police Check MI6 Agents' DNA in Dead Spy Probe They think a coworker was in Williams' flat By Kevin Spak, Newser Staff Posted May 3, 2012 2:05 PM CDT 2 comments Comments This CCTV image issued by the London Metropolitan Police shows Gareth Williams at Holland Park Tube station in London on Aug. 14, 2010. (AP Photo/Metropolitan Police, ho, File) (Newser) – London Metropolitan Police suspect that one of Gareth Williams' MI6 co-workers was in his apartment the night he died, and they want DNA samples from 50 of them to test that theory, the Telegraph reports. Weak traces of DNA from at least two people have been found in the flat, and police think there might be more on a green hand towel found in Williams' sink. The revelation comes a day after the coroner looking into Williams' death said that the possibility that MI6 had killed him was "still a legitimate line of inquiry." Police have already taken samples from 15 MI6 employees. They're also looking into whether a telephone reset close to the time of Williams' death might have any clues. At the same time, the department is investigating its own handling of the case, after the coroner raked police over the coals for its handling of evidence.