LOS ANGELES, Nov. 30 (Xinhua) -- Police detectives and prosecutors who are engaged in the investigation of the cause of sudden death of the late pop icon Michael Jackson are unlikely to file criminal charges well before 2010, the Los Angeles Times reported Monday, quoting law enforcement sources.

    The officials, who refused to have their names published as the probe is still underway, said a decision is "months rather than weeks away." An investigation conducted by the Los Angeles Police Department (LAPD) has brought forth a wealth of information that prosecutors and a number of outside medical specialists were enlisted to help analyze the information, they said. Given the complexity of the information, opinions from the medical circles were needed before any decisions can be made.

    Conrad Murray, the late pop singer's personal physician, has been the focus of an investigation but no criminal charges against him have been filed so far.

    Murray, 56, has admitted to LAPD detectives that he had administered propoful, a powerful prescription anesthetic drug as well as some other sedatives on Jackson to help him get some sleep on June 25, when the singer was in the heat of a rehearsal for his planned London concert. Later Murray found Jackson was in a coma, and called 911 to send Jackson to University of California, Los Angeles medical center. The singer was declared dead.

    As the sudden death of the pop king was classified by the Los Angeles County coroner's office as a homicide resulting from "acute propofol intoxication," the LAPD detectives searched Murray's clinic and questioned some key witnesses, including his girlfriend Nicole Alvarez.

    The physician has insisted his innocence and went back to work last week in his Houston clinic, the newspaper reported.