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A law enforcement official close to the Jackson investigation confirms what was already suspected: His live-in doctor, Dr. Conrad Murray, injected the fatal and final dose of the anesthetic propofol which ultimate caused the pop star's cardiac arrest.

The source tells the AP that Murray administered the drug, which Jackson is thought to have routinely used for his insomnia, to the pop star on the last night of his life.

Dr. Conrad Murray is currently being investigated for manslaughter.

The results of the toxicology tests have still yet to be revealed.