Conrad Robert Murray, the former doctor convicted of involuntary manslaughter in the death of Michael Jackson, could be a free man as early as Oct. 28.

According to The (U.K.) Daily Mail, Murray could be released early as a result of good behavior and the overcrowded California prison system.

Murray was convicted on Nov. 7, 2011 of giving Jackson a fatal dose of Propofol, a drug used as an anesthetic. He was sentenced to serve a total of four years.

According to documents released by the Los Angeles Superior Court, he caused the death of Jackson by aiding the King of Popโ€™s drug habit and grossly abusing his training as a medical doctor.

โ€œOn April 6, 2009, the defendant ordered 35 vials of propofol to administer to Michael Jackson. On April 28, 2009, the defendant ordered another 65 vials of propofol. On May 12, 2009, the defendant ordered an additional 65 vials of propofol,โ€ the documents state. โ€œFinally on June 10, 2009, the defendant ordered another 90 vials of propofol.โ€

โ€œIn total, the defendant ordered over four gallons of this anesthetic drug and, according to the defendant, he administered it to Michael Jackson on a nightly basis for over two months.โ€

The documents also say that on June 25, 2009, Murray not only satisfied Jacksonโ€™s propofol addiction, but administered benzodiazepines as well.

According to information released by The Mental Illness Research, Education and Clinical Centers, benzodiazepines, like Xanax, can be used for issues with sleep or anxietyโ€”but are not intended to relieve โ€œthe stress of everyday life.โ€

At the time of his death, Jackson had been preparing for what was said to be his last tour ever, appropriately titled โ€œThis Is It.โ€

His mother, Katherine Jackson, is currently engaging in a legal battle with concert promoter AEG Live, claiming in a wrongful death suit that the company was negligent in allowing the starโ€™s condition to worsen with no intervention, fearing the possibility of cancelled concert dates.

Jackson was 50 at the time of his death.