AbstractMyocardial infarction is the most common cause of sudden unexpected death.On autopsy the evidence of coronary artery narrowing and gross changes are important for the diagnosis. But gross changes took 24 to 48 hours to occur , So the histochemical staining on gross by TTC is more helpful, as it diagnose infarction within 6 hours of death , And also the area from which the section should be taken also can be decided. Key Words: Myocardial infarction; TTC stain; Gross Diagnosis.