The editor of the News of the World at the time of Princess Diana's death has said he felt "huge responsibility" for the Paris car crash which killed her.
Princess Diana and Dodi Fayed died in a car crash in 1997
Phil Hall told an ITV documentary if it were not for the paparazzi following Diana's Mercedes when it crashed the accident might not have happened.
Patrick Jephson, Diana's former aide, likened the Paris paparazzi to bandits attacking a stagecoach.
The princess died in 1997 along with Dodi Fayed and driver Henri Paul.
In the documentary, entitled Diana's Last Summer, Mr Hall says: "I felt huge responsibility for what happened and I think everyone in the media did."
He adds: "It's difficult because we knew the full story, we knew that Diana was helping newspapers and yes, the driver was drunk.
"But my view is that if the paparazzi hadn't been following her the car wouldn't have been speeding and, you know, the accident may never have happened."
The documentary focuses on the relationship between Diana and the photographers who tracked her every move.
The programme makers speak to members of the paparazzi who followed her before the crash in the Pont de l'Alma tunnel on 31 August and include some of their photographs.
Diana's former security chief Ken Wharfe is also interviewed.
Patrick Jephson told the programme: "The Paris paparazzi were a well-known phenomenon. They were a kind of circus.
"They would chase the royal motorcade on motorcycles. They had pillion passengers carrying heavy television cameras. It all contributed to the sense of being inside a Wild West stagecoach while bandits were attacking it."
An inquest into the deaths of Diana and Dodi Fayed is scheduled to start in October.
Diana's Last Summer will be shown on ITV1 at 2100 BST on Wednesday.