The former "Charlie's Angel's" star was diagnosed with anal cancer in 2006. Although doctors declared her free of cancer in February 2007, a few months later they learned that the cancer had returned.
Fawcett's alternative approach to her cancer treatment has been surrounded by much controversy. After her initial diagnosis, Fawcett received traditional treatments in California.
According to People.com, Fawcett was "disheartened" by both the reoccurrence of the cancer and the treatment she was receiving in the United States, so she traveled to Germany's University Clinic in Frankfurt in search of an alternative course of treatment.
Some reports have said that she received experimental stem cell treatment while in Germany. But Nevius told ABCNews.com that while it's been widely reported, it has never been confirmed by Fawcett or sources close to her.
Nevius said that the actress' documentary that chronicles her battle with cancer, "A Wing and a Prayer," is slated to run on NBC later this year, although an air date has not yet been set.
Earlier, he told ABCNews.com that the footage was shot by Fawcett or her friends on a home video camera.
Last year, an employee at the UCLA Medical Center was disciplined for accessing Fawcett's medical records, a few weeks after the hospital announced that several employees had been fired for snooping in Britney Spears' records.
Fawcett's attorney told The Associated Press that an employee at the hospital reviewed the actress' medical records without authorization and then details about her treatment appeared in the tabloid the National Enquirer.
Fawcett first stepped into the spotlight playing Jill Munroe in the TV series "Charlie's Angels" in the 1970s. The series became a smash hit and Fawcett quickly became an iconic pin-up model for millions of men.
She later went on to win one of three Emmy Award nominations for her role as a battered wife in the acclaimed television movie "The Burning Bed."
The Associated Press and ABC News Research's Gerard Middleton contributed to this report.