The official said on Tuesday that prosecutors will file a criminal complaint against Dr. Conrad Murray in court rather than go through a secret grand jury.
The person is not authorised to speak publicly about the case and only spoke on condition of anonymity.
The complaint would be the prelude to a public hearing in which a judge would weigh testimony from witnesses to decide if there is cause to try him on an involuntary manslaughter charge.
The singer died on June 25 from an anaesthetic overdose. Murray maintains nothing he gave Jackson should have killed him.
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