A prosecutor told a Los Angeles jury Thursday that Michael Jackson's doctor is responsible for leaving the singer's three children without a father.

Delivering his closing arguments after a six-week trial, Deputy District Attorney David Walgren said Dr. Conrad Murray was criminally negligent in Jackson's 2009 death.

He said Murray violated the trust between doctor and patient, calling the evidence in the case “overwhelming.”

Murray faces charges of involuntary manslaughter for giving Jackson the powerful anesthetic propofol to help him sleep, and then failing to properly monitor the entertainer's health.

Prosecutors have said Murray gave Jackson the lethal dose and lacked the equipment that could have saved the singer's life. But the defense says Jackson took the propofol himself and overdosed.

Murray, a cardiologist, faces four years in prison and the loss of his medical license if convicted.

Jackson died June 25, 2009 at his rented Los Angeles mansion. He was 50 years old. Murray had been giving Jackson propofol to help him sleep, even though the drug was not approved for use as a sleep aid.

Apart from the criminal trial, Jackson's father has filed a wrongful death suit, accusing Murray of lying to the doctors and paramedics who tried to save the singer's life.