LOS ANGELES — An emergency room physician told jurors Monday that Michael Jackson’s doctor never mentioned that he had given the singer the powerful anesthetic propofol.

Dr. Richelle Cooper recounted her conversations with Dr. Conrad Murray on the day Jackson died, telling jurors that he told her that he had only given the singer the sedative lorazepam.

Cooper resumed testifying Monday as Murray’s involuntary manslaughter trial began its second week.

Murray, 58, has pleaded not guilty and his defense lawyers claim Jackson gave himself a fatal dose of sedatives and propofol, which is normally administered in hospital settings.

Authorities say he administered the fatal dose and acted recklessly by providing Jackson the drug as a sleep aid. Cooper testified she never asked Murray to sign a death certificate because, by the time he was brought to Ronald Reagan UCLA Medical Center, Jackson became her patient.