Michael Jackson's personal physician Conrad Murray failed to turn himself in to the Los Angeles enforcement authorities as widely expected earlier Friday since negotiations between prosecutors and his defense attorneys to secure his surrender have broken down, throwing into doubt when charges might be filed in Jackson's death.

Defense attorney Ed Chernoff had suggested that Conrad Murray was ready to surrender where and when requested as soon as he is charged. Murray was working as Jackson's personal physician while the singer prepared in Los Angeles for a series of London concerts, and is expected to be charged with involuntary manslaughter for Jackson's death from an overdose of prescription medications.

But law enforcement sources told the Los Angeles Times that defense attorneys have objected to prosecutors' calls for Murray to make a formal court appearance where a judge would set the terms of his bail and dictate any restrictions on his movements.

Instead, the attorneys want their client to be allowed to post bail at a police station, the sources told the newspaper late Thursday, according to an article posted on the Times' Web site.

The dispute could delay plans to file involuntary manslaughter charges, which had been expected as early as Friday.

Once the District Attorney's Office pulls the trigger, Murray is expected to be charged and arraigned at the Airport Branch Courthouse, which has the jurisdiction over the area where the late King of Pop rented a house to prepare for his 50-concert comeback series at London's O2 arena. On June 25, the singer, 50, was found not breathing. He was rushed to Ronald Reagan UCLA Medical Center, where he was pronounced dead around 2 p.m.

Murray has insisted he didn't give Jackson anything that should have caused his death.

In a one-minute video posted on YouTube in August, Murray told his patients and supporters that he "told the truth, and I have faith the truth will prevail."