Dr. Richelle Cooper, emergency room physician testifies during the Conrad Murray involuntary manslaughter trial in downtown Los Angeles, Friday, Sept. 30, 2011. Murray has pleaded not guilty and faces four years in prison and the loss of his medical license if convicted of involuntary manslaughter in Michael Jackson's death. (AP Photo/Al Seib, Pool)

Associated Press
Dr. Richelle Cooper, emergency room physician testifies during the Conrad Murray involuntary manslaughter trial in downtown Los Angeles, Friday, Sept. 30, 2011. Murray has pleaded not guilty and faces four years in prison and the loss of his medical license if convicted of involuntary manslaughter in Michael Jackson's death.   (AP Photo/Al Seib, Pool)
Dr. Richelle Cooper, emergency room physician testifies during the Conrad Murray involuntary manslaughter trial in downtown Los Angeles, Friday, Sept. 30, 2011. Murray has pleaded not guilty and faces four years in prison and the loss of his medical license if convicted of involuntary manslaughter in Michael Jackson's death. (AP Photo/Al Seib, Pool)
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