New ABC documentary turns spotlight on Princess Diana's legacy

ABC's new documentary "The Story of Diana" is turning the spotlight on Princess Diana's legacy, 20 years after her untimely death.

RELATED: A look back at the life of Princess Diana

It will be the only program in the U.S. to feature an interview with Diana's brother, Charles Spencer.

Watch the video in the player above for ABC's Chris Connelly's sneak peek on "Good Morning America."

The two-part series starts Wednesday, August 9 at 9 p.m. on ABC7.

RELATED: Prince Harry on Princess Diana, having kids

RELATED: Roots of Peace founders found inspiration in Princess Diana and, now, in son Harry

Click here for more stories about the royal family.