LOS ANGELES — Dr. Conrad Murray, who has been trying to surrender to authorities for a week, will likely get his chance with prosecutors saying they will file a charge today in the death of Michael Jackson.

A district attorney's spokeswoman did not name the doctor nor say what the charge will be, but Murray's lawyers have said they expect a single charge of involuntary manslaughter against the man who administered an anesthetic to the singer before he died.

In a brief statement posted on his Web site today, Murray's lead attorney said his client is prepared to surrender at the courthouse adjacent to Los Angeles International Airport at 4:30 p.m. Butler time. In anticipation of his arrival, TV news vans and satellite trucks filled the courthouse parking lot before dawn.

As the last person to see Jackson alive, Murray has been the focal point of a police investigation since Jackson died last June 25. Murray acknowledged he administered the hospital anesthetic propofol and other sedatives as Jackson, a chronic insomniac, struggled to sleep.

Murray had been hired as the performer's personal physician as he prepared for a monumental comeback concert in London.

The death of the pop superstar left the doctor's life and medical practice in limbo. There was talk of a criminal case even before a coroner's report found that Jackson's death was a homicide and pinpointed propofol and other drugs as the cause.