The case against Dr. Conrad Murray is complicated, involving drugs, dosages, medical protocols and other complex issues. Defense lawyers and prosecutors are crafting their legal strategies ahead of a summertime preliminary hearing where much of the evidence may become public.

Already, potentially damaging information about Murray has been revealed.

An autopsy report found Jackson died from an overdose of the powerful anesthetic propofol. In a statement to police, Murray acknowledged giving Jackson the drug and other sedatives to help him sleep, then briefly leaving his bedside. Cellular phone records show he made at least three personal calls around the time Jackson was stricken.

A Jackson employee who said he was in the room while Murray worked to save the pop star told police the doctor interrupted CPR to collect drug vials.

Murray maintains his innocence, and his lawyer, Ed Chernoff, has said nothing that he gave Jackson "should have" killed him. Chernoff noted the Jackson employee gave a different version of events to police in another statement.