Vincent Messina says that he knows what happened to Princess Diana the night the car she was a passenger in was in an accident in a Paris tunnel leading to her death.

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“When I saw the skid marks, two things stood out,” Messina says. “One, that they were quite long which means the vehicle was speeding way in excess of 60 mph to me. And two, that it hit something else.”

WATCH: Why Police Detective Says He Believes The French Police Botched The Investigation Of Princess Diana’s Death

Hear more of his theory in the video above. And, see his recreation of what he says happened to the Mercedes Benz. And, Dylan Howard, host of the podcast “Fatal Voyage: Diana: Case Solved,” and detective Colin McLaren, who flew to Paris to investigate the accident for himself, share new information surrounding the tragedy.  
On Monday’s episode of Dr. Phil, hear from two people who say they were some of the last people to see Princess Diana alive after the crash. Check here to see where you can watch.