She told ABC's Diane Sawyer in 2002: "The biggest devil is me. I'm either my best friend or my worst enemy."
Houston tried to stage a comeback with the 2009 album I Look To You, but things fell apart when a concert to promote the album was clearly off-key.
Broadcaster and music journalist Paul Gambaccini described Whitney Houston's voice as "the template for female vocal performers for the last 30 years".
But in the end, he told the BBC, she became the victim of a "self-administered decline" and, sadly, threw all it all away.
Read it all.
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