Audio: Michael Jackson's haunting voice echoes in trial

  The most surprising testimony in the first day of the trial of Michael Jackson's personal physician may have come from the pop star himself.

Deputy Dist. Atty. David Walgren played a recording that had never been publicly heard. It was the voice of a heavily drugged Michael Jackson, mumbling. The prosecution said it was recorded on Dr. Conrad Murray's iPhone, though they did not play it during the preliminary hearing or at any other court dates.

Live video: Full coverage of Conrad Murray's trial

"When people leave my show, I want them to say, 'I've never seen nothing like this in my life,' " Jackson said. Walgren said Jackson was "under the influence of unknown agents."

The slurring voice on the recording shows Murray was aware of "Michael's state" as he continued to offer him drugs.

As the recording played, Katherine Jackson bit her lip and wiped away tears as her daughter, La Toya Jackson, held her hand.

Murray is charged with involuntary manslaughter and administering a lethal dose of the surgical anesthetic propofol.

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-- Harriet Ryan and Victoria Kim at Los Angeles County Superior Court