Michael Jackson's doctor has been charged with involuntary manslaughter in the pop singer's death last year, according to reports.

Los Angeles prosecutors charged Dr Conrad Murray, Michael Jackson's cardiologist, on Monday.

Dr Murray, who was with Michael Jackson when he died on June 25, faces up to four years in prison if convicted, according to the Associated Press.

Murray's attorney Ed Chernoff says Murray will plead not guilty to the charges.

We'll make bail, we'll plead not guilty and we'll fight like hell, he said.

Jackson died at his home last June at the age of 50. The singers death was ruled as homicide, mainly caused by the anaesthetic Propofol.

Dr Murray told police he had been giving Jackson Propofol as part of his treatment for insomnia, according to an affidavit made public in August.

Dr Murray had been hired to be Jackson's personal physician last spring as the singer prepared for his high-energy concerts in London.