Princess Diana was one of the most beloved public figures in the world. After marrying Prince Charles at just 20 years old, Lady Diana Spencer became known as the People’s Princess because of her passionate advocacy, lovingness as a mother, and her deep connections to those with whom she came in contact.

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But tragedy struck one night in 1997 when Princess Diana died after a car crash.
 

Watch her story in the video above.

WATCH: Why Police Detective Says He Believes The French Police Botched The Investigation Of Princess Diana’s Death
 
On Monday’s episode of Dr. Phil, he takes a fresh look at her tragic death. Was it an accident -- as it was officially ruled – or did something more sinister occur? A private investigator claims he has new clues and information about what really happened when Princess Diana’s car crashed in a Paris tunnel. Check here to see where you can watch.