'She was religious in putting on her seat belt:' Princess Diana's sister speaks out

As the 20th anniversary of Princess Diana's death nears, her sister, Lady Sarah McCorquodale, reveals new insight into the life and death of the British royal. SUBSCRIBE to GMA ►    / @gma   To read the full story and others, visit http://www.goodmorningamerica.com Good Morning America (GMA) brings viewers an award-winning combination of breaking news, exclusive investigations, hard hitting interviews, weather forecasts, cutting edge medical field information, and financial reporting every morning. Join Robin Roberts, George Stephanopoulos, Lara Spencer, Michael Strahan, Amy Robach and Ginger Zee weekdays at 7am on ABC. Follow GMA across the web-- Facebook:   / goodmorningamerica   Twitter: https://twitter.com/GMA?ref_src=twsrc... Instagram: https://instagram.com/goodmorningamer...