Not only the cardiologist Conrad Murray illegally supplied opioids and other drugs to Michael Jackson before his death in the summer of 2009.
As police officer Orlando Martinez told the producers of the film documentary "TMZ Investigates: Who Really Killed Michael Jackson", the singer had been supplied with medication by various doctors.
During a search of his mansion, investigators from the Los Angeles Police Department (LAPD) are said to have found almost 20 ID cards with which Jackson ordered prescription drugs under a false name.
“Michael was largely responsible for his own death.
But many doctors contributed to his death," said Harry Glassman, the singer's ("Thriller") former cosmetic surgeon.
Jackson died in June 2009 after an overdose of the anesthetic propofol in a rented villa in the Holmby Hills neighborhood of Los Angeles.
After the death of the 50-year-old "King of Pop" in 2011, prosecutors brought charges of negligent homicide against his family doctor Murray.
The doctor was then sentenced to four years in prison, of which he only served two.