Myocardial infarction is now a well-recognized complication of cocaine abuse. This report describes a 38-year-old man who sustained simultaneous acute thrombosis of two major epicardial coronary arteries shortly after intravenous cocaine use. The finding of layers of mural thrombus of varying age, from acute to two to three days, in both coronary arteries represents a previously unreported finding (to our knowledge) in cocaine-associated cardiac death. Potential mechanisms for the association between cocaine use and infarction and the cardiac pathologic findings in cocaine-associated death are discussed.