Princess Diana's death in a car crash in 1997 shocked the world and ignited a debate about how and why she died. An in depth examination of two police investigations into her mysterious demise.

The French police call Diana's death an accident, but Mohamed Al-Fayed is sure his son and the princess were murdered, and has no scruples about naming who he thinks is responsible. In Britain, calls grow for an independent British inquiry.

An inquest declares Diana's death an accident. But the conspiracy theories continue, from rumours of her Mercedes being tampered with, to the suspicious death of a photographer who many believe drove the Fiat Uno that may have caused the crash.