LOS ANGELES- Prosecutors have delayed filing charges against Michael Jackson's doctor and the physician will not surrender to authorities on Friday as expected, a law enforcement source said.

Lawyers for Conrad Murray had said earlier Thursday that the Houston-based physician who has been at the center of a seven-month criminal investigation would turn himself in to be charged.

The development followed a day of negotiations between prosecutors and defense attorneys that focused on how to deal with Murray, who is expected to face charges of involuntary manslaughter in the June death of Jackson.

However, a law enforcement source with knowledge of the matter said plans for Murray to surrender and appear in court Friday were now off.

"Contrary to previous reports, Conrad Murray will now not turn himself in on Friday as his lawyer had previously stated and charges will not be filed," the source told AFP on condition of anonymity.