Transcript for Princess Diana's brother 'lied to' over coffin walk at her funeral

A princess Diana's brother is reviewing new details about his sister's funeral as we approach the twentieth anniversary of her death. Earl Spencer says he still has nightmares about that day he says. He'd been told that William and Harry wanted to walk behind their mother's coffin but says that was now lie he calls the procession horrifying and cool.

This transcript has been automatically generated and may not be 100% accurate.