The documents have proved that Klein treated the King of Pop with vast amounts of the painkiller Demerol. They show that the 'Thriller' star's first major battle with drug addiction occurred shortly after the doctor treated him with four times the daily maximum recommended amount of the drug.
The star's former plastic surgeon and friend, Dr. Steven Hoefflin, has said that the evidence from Klein's 1993 files was "horrifying reading". "I had no idea Michael was being given this insane amount of Demerol," British tabloid The Sun quoted him as saying.
"The maximum amount you should give a patient of his weight and build in severe surgical pain is 200mg a day. Michael was being given 800mg a day. I feel Dr Klein was over-treating him to make money. I have launched a lawsuit against Dr Klein for fraud. It is my opinion that he got my patient addicted to Demerol," he added.