INSIDE STORY: Brittany Murphy's 'Inner Demons'

Brittany Murphy came to Hollywood as a teenager full of talent and promise -- but struggled to reach her full potential over her 18-year career, sources tell PEOPLE, due to a set of "inner demons" that included troubling body image issues.

"She was drastically different when she entered the business," a friend tells PEOPLE "Full of life, determined. But over the past few years, [she went] downhill. There was always something off, something in the way. She had a lot of inner demons."

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