Rapper Heavy D died of a pulmonary embolism, a Los Angeleas Coroner’s office report released on Tuesday revealed. Heavy D (real name: Dwight Arrinton Meyers), died at the age of 44 on November 9th after collapsing outside of his Beverly Hills condo.

According to police, Heavy D was returning from a shopping trip on the morning of November 7th when he began having difficulty breathing. Designer Adam Mills, who was in the building and knew the rapper, said he found Heavy D outside the building in severe distress. According to TMZ.com, Mills held the rapper in his lap while 911 was called and said the hip-hop star was conscious and kept saying, “I can’t breathe, I can’t breathe.”

After his collapse, the beloved rapper was transported to Cedars-Sinai Medical Center in Los Angeles. Heavy D was pronounced dead later that day at 1PM. He was only 44-years-old.

According to the Heavy D autopsy report, the rapper’s death was ruled as natural and the Heavy D cause of death was officially listed as a pulmonary embolism with deep vein thrombosis. The rapper also reportedly had heart disease, which could have been a contributing factor.

The blood clot that killed Heavy D was “most likely formed during an extended airplane ride,” L. A. County Coroner Department chief Craig Harvey said in a press statement. The clot likely formed in his legs due to a lenghty period of immobility and then travelled up to block blood flow to the lungs.

Heavy D had just recently returned from a trip to London to perform at a Michael Jackson tribute concert a few days before before his death.

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