A statement from Ed Chernoff said he was negotiating with the district attorney's office for Dr. Conrad Murray to turn himself in, but there has been no agreement on specifics, The Associated Press reported.
"When the agreement is complete, we will report further," Chernoff said.
Murray has maintained that nothing he gave Jackson should have killed him.
Murray's arraignment already has been set for this afternoon, a person familiar with the planning told The Associated Press. The person declined to be named because of the sensitivity of the situation.
The possible charge was not disclosed. However, two law enforcement officials have told the AP prosecutors plan to charge Murray with involuntary manslaughter, alleging he gave Jackson a powerful anesthetic that led to his June 25 overdose death at a rented mansion in Los Angeles.