MI6 codebreaker Gareth Williams was probably killed but the “spy in the bag” case might never be solved after mistakes by investigators, an inquest has heard.

Specks of mystery DNA were discovered on the bag encasing the curled-up body of MI6 spy Gareth Williams, an inquest heard.

Secret agents specialising in the “dark arts” might have tried to cover up the mysterious death of an MI6 spy found in a holdall, a coroner in Britain heard today.

MYSTERY death spy Gareth Williams visited a series of bondage websites in the months before his death, police revealed yesterday.