Shizuo Kambayashi / Invision/AP 1 / 3
Shizuo Kambayashi / Invision/AP 1 / 3

In a 911 call, a caller at Michael Jackson's rented Los Angeles home frantically tells the dispatcher that the King of Pop is "not breathing" and assistance is needed.

Listen to the 911 call at TMZ.com

"We have a gentleman here that needs help and he's not breathing," said the man, who placed the call at 12:21 p.m. PST Thursday. "He's not breathing, and we're trying to pump him... He's not conscious, sir."

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The caller -- who did not identify Jackson by name -- told the dispatcher that Jackson's personal physician had already begun doing CPR.

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"We have a personal doctor [Dr. Conrad Murray] here with him, sir, but he's not responding to anything," the caller said. "He's not responding to CPR or anything."

When asked if anyone saw what happened, the man replied, "The doctor has been the only one here."

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Jackson, who suffered cardiac arrest, was pronounced dead at 2:26 p.m. PST.