Michael Jackson was already dead when his physician called for help, a prosecutor has said.
David Walgren was opening a preliminary hearing in Los Angeles to decide whether Dr Conrad Murray should stand trial for involuntary manslaughter.
Walgren said evidence would show that Murray also tried to conceal his administering the powerful anaesthetic, propofol, to Jackson, ordering a bodyguard to collect items before paramedics were called.
“The evidence will show through the expert testimony, by all accounts, Michael Jackson was dead in the bedroom at 100 North Carrolwood prior to the paramedics arriving,” Walgren said.
At the end of the hearing, a judge will determine whether there is enough evidence for Murray to stand trial.
The cardiologist has pleaded not guilty and his lawyers have said he did not give Jackson anything that should have killed him.
Walgren said he will rely on Murray's statements, as well as text messages, phone records and expert testimony to show that the doctor should stand trial.
He said evidence will show Murray waited at least 21 minutes to call for an ambulance.
In the most favourable interpretation, Walgren said, Murray waited at least nine minutes.
Walgren plans to call several experts he said would testify that “there are a number of actions displayed by Dr Murray which show an extreme deviation from the standard of care”.
The prosecutor also said he would call a bodyguard who would testify that Murray ordered him to collect items from Jackson's bedroom.