Bruce Jenner's ex-wife Linda Thompson tells all

Linda Thompson has written about how he opened up to her about his gender identity.

A file picture taken on 30 July, 1976 in Montreal, shows USAs Bruce Jenner (C) celebrating his gold medal on the podium after winning the mens decathlon competition, next to West German silver medalist Guido Kratschmer (L) and USSRs bronze medalist Nikolay Avilov. Picture: AFP.

JOHANNESBURG - Bruce Jenner's ex-wife Linda Thompson has in a touching tell-all piece, revealed how he opened up to her exclusively during their marriage about his gender identity.

Her brief account also reveals personal details about Bruce's delightful, yet "too good to be true" character.

In her _Huffington Post _article she writes, "I have respectfully kept his secrets private and would have taken his confidences to my grave had he not spoken out.

But now, many years into his remarkable life, he has spoken out.

His legacy will likely be sprinkled with references like "Olympian," "decathlon gold medalist," "world's greatest athlete," "son," "brother," "husband," "father," "grandfather," "friend," and, hopefully, "pioneer" and "trailblazer for the civil rights of the transgender community."

Read the full article here.

The Olympic gold medalist and reality TV star said on Friday that he identifies as a woman, becoming the most high-profile American to come out as transgender.

The 65-year-old made the declaration in a wide-ranging interview with ABC's Diane Sawyer, nearly 40 years after his record-breaking Olympic gold-medal win in the decathlon that gave him the unofficial title of "World's Greatest Athlete."

WATCH: Dianne Sawyer interviews Bruce Jenner.