The death of UK spy Gareth Williams in 2010 has become one of the most high-profile unsolved mysteries in years after his naked body was discovered padlocked inside a duffel bag. Described as a genius mathematician who the intelligence service had recruited, Gareth’s exact cause of death remains unknown, and people can’t agree whether he could have locked himself in there on his own or whether someone else was responsible. 

There have been a number of theories over the years, including sex games gone wrong and Russian spies. But even today, there are still so many unanswered questions about his death.

What happened to him, and how can forensic science help us find those answers?