Michael Jackson fans were devastated by the loss of the King of Pop back in 2009. In an unexpected turn of events the star became unresponsive after suffering a cardiac arrest in his rented mansion in Beverly Hills, Los Angeles.
While his death was entirely surprising, his personal physician, Conrad Murray, was eventually charged with involuntary manslaughter, after it came out that he had provided Jackson with some medication prior to the heart attack.
One year before Jackson's death, however, it was revealed that the star was more unwell than fans may have initially thought.
His official biographer, Ian Halperin, claimed Jackson suffered from a number of ailments, lessening his quality of life.
Halperin also claimed Jackson had an inherited disease that restricted protein in the lungs, and left him gasping for breath.
READ MORE: Michael Jackson had an award NAMED after him due to humanitarian work
Michael Jackson: The star supposedly required surgery (Image: GETTY)
Michael Jackson: The star gave a lot of humanitarian effort during his career (Image: GETTY)
In 2008 Halperin told The Sun that the situation had become "critical".
He then detailed a painful operation that Jackson required, despite perhaps not being able to actually get it.
"He needs a lung transplant," Halperin explained. "But may be too weak to go through with it.
"He also has emphysema and chronic gastrointestinal bleeding, which his doctors have had a lot of trouble stopping."
Michael Jackson: The star managed to make quite the impact in a lot of lives (Image: GETTY)