Washington, July 28 - Michael Jackson's personal physician, Dr. Conrad Murray, administered the final deadly shot of the anaesthetic propofol that would end the pop star's life June 25, media reports here said.

Murray, who was at the Jackson California rental home when he died, administered the powerful drug that authorities believe killed the singer, CNN said citing a source close to the Jackson family and with knowledge of the investigation.

The coroner's office in Los Angeles is investigating the cause of Jackson's death. It has been waiting on toxicology lab results, but a final autopsy report is expected as soon as this week, a coroner's spokesman has said.

The cause of death is also the focus of an investigation by police, the state attorney general's office and the US Drug Enforcement Administration.

Dr. Conrad Murray has been identified in court papers as the subject of a manslaughter investigation, ABC News said. Edward Chernoff, an attorney for Murray, declined to comment on the report.

Murray, who was hired to monitor the entertainer for his planned 'This Is It' tour, was called to Jackson's house on June 24 and was the person who found him unconscious, not breathing in bed the next day.