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Dr. Conrad Murray sits in a courtroom during his involuntary manslaughter trial on October 21, 2011 in downtown Los Angeles, California.  Murray faces four years in prison and the loss of his medical license if convicted of involuntary manslaughter in Michael Jackson's death.
Dr. Conrad Murray sits in a courtroom during his involuntary manslaughter trial on October 21, 2011 in downtown Los Angeles, California.  Murray faces four years in prison and the loss of his medical license if convicted of involuntary manslaughter in Michael Jackson's death.

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    Conrad Murray: A look back

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Conrad Murray: A look back

CNN's Sara Sidner takes a look back at the trial of Conrad Murray.

Conrad Murray: A look back

CNN's Sara Sidner takes a look back at the trial of Conrad Murray.