Carbon monoxide (CO) exposure is a common cause of unintentional poisoning. Clinical manifestation usually involve central nervous and cardio-vascular systems as brain and heart are very sensitive to hypoxia. Myocardial infarction pathogenesis during CO intoxication is complex. Generalised tissue hypoxia and increased thrombotic tendency may play an important role. A case of ST-segment elevation myocardial infarction following CO poisoning in a 58-year-old male is presented.