I may not be a solid Whitney Houston fan which knows everything about her but I'm just one of those who watched out the result of supposed comeback in the music scene. IMO, she just wanted to regain her glory but unfortunately it didn't turned out well.
From Yahoo! post,
A concert to promote the album on "Good Morning America" went awry as Houston's voice sounded ragged and off-key. She blamed an interview with Winfrey for straining her voice.As to cause of her death, Whitney Houston's death is still unknown.
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