heavydbet122611230Rapper Heavy D, who passed away on November 8th at the age of 44, died of a fatal pulmonary embolism, according to The Los Angeles County Coronor's Office.

The preliminary results from the autopsy report say that the "Now That We Found Love" singer suffered a deep vein thrombosis ... a formation of a blood clot in a deep vein usually found in the leg.

Heavy D reportedly sought treatment from a doctor just before his death after complaining of a persistent cough. He also suffered from heart disease and the effects of high cholesterol.

His death has been ruled "natural." The final autopsy report will be available in two weeks.