AP Source: Jackson suffered a heart attack

LOS ANGELES (Yahoo News) – Michael Jackson, who was with a cardiologist when he collapsed at his rented home in Los Angeles, appeared to have suffered a heart attack, a person with knowledge of the situation told The Associated Press.

The person, who was not authorized to speak publicly and requested anonymity, said Jackson suffered a heart attack, which is a blocking of the arteries that deprives the heart of adequate blood. That can lead to cardiac arrest, an interruption of the normal heartbeat.

Jackson's brother Jermaine said Thursday that it was believed the pop singer went into cardiac arrest. The Los Angeles County coroner's office, which completed its autopsy Friday, said determining the cause of death will require further tests that will take six to eight weeks.