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LOS ANGELES—  People can debate forever over who’s to blame in Michael Jackson’s death; is he responsible or the Houston doctor who allegedly administered him a deadly dose of drugs?

Whatever the argument, a jury will decide the fate of Dr. Conrad Murray.  As the trial kicked off Tuesday, prosecutors hit hard with a shocking piece of evidence.

Prosecutors played a powerful voice recording of Jackson that showed Jackson’s alarming state before his death. In the recording on May 10, 2009, Jackson appeared to be somewhat incoherent and his speech was slurred as he talked about his concert.

Prosecutors argued the evidence showed Murray had clear knowledge of Jackson’s condition, yet still administered Propofol to the singer.

Prosecutors said Murray actually recorded Jackson on his iPhone.

“We have to be phenomenal. When people leave this show, when people leave my show, I want them to say I’ve never seen anything like this in my life….he’s the greatest entertainer in the world,” Jackson said in mumbled ramblings.

Prosecutors said just a few days after the recording, Murray ordered 40 bottles of Propofol.

Listen to the audio recording prosecutors played for jurors below, courtesy of khou.com: