Dr. Richelle Cooper, the emergency room doctor who attempted to save Michael Jackson's life, told jurors on Monday that the pop star’s children were "hysterical" when she attempted to tell them their father had died, RadarOnline.com is reporting.

Cooper took to the stand Monday to testify in the Dr. Conrad Murray trial and recounted how after she declared Jackson dead at 2:26 p.m., she told them the tragic news and: "They were crying, they were fairly hysterical."

Dr. Murray's attorney, Michael Flanagan's questioning of Dr. Cooper got contentious at points when she couldn't answer hypothetical questions about the use of propofol, because she says she isn't qualified to administer the powerful anesthetic. Dr. Cooper stated on cross examination that "Mr. Jackson died long before he became a patient."