As Brittany Murphy’s parents await more details from the Los Angeles County Coroner’s office as to why their daughter died suddenly on Sunday, sources close to the family said her father, Angelo Bertolotti, and mother, Sharon Murphy, are in a state of shock.

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“Friends and people in her circle in Hollywood seem to feel like this (Murphy’s death) was a possibility, but her parents never saw it coming. She put on a good face,” said one source who knew of Murphy’s recent struggles.

Those struggles, specifically, had a lot to do with the pressure she put on herself. “She was an overachiever. She wanted to be a huge success, and it never felt like she was doing well enough,” said the source. “Whether it had something to do with her death, I don't know. But the pressure she put on herself did impact her physically.”