The New York Medical Examiners office told Radar in a statement that the rocker's cause of death was determined to be "Hypertensive and Atherosclerotic Cardiovascular Disease." His manner of death was natural.
As Radar previously reported, the singer was found unresponsive in his New York City townhouse on Sunday, September 15.
His estranged wife, model Paulina Porizkova, discovered his body around 4 p.m.
The two split last year following 28 years of marriage.
The Cars were founded in 1976 and known for hits such as "My Best Friend’s Girl,” “Just What I Needed,” “Shake It Up” and “Drive.”
Ocasek was inducted into the Rock and Roll hall of fame in 2018.
He was 75 years old.