A 57-year-old man presents with a 4-hour history of chest pain radiating to his neck, with associated diaphoresis and dyspnoea. His CK-MB and troponin I are mildly elevated, and his ECG shows anterior wall ST elevations. He dies suddenly following a ventricular tachycardia/ventricular fibrillation arrest. The gross appearance of his heart is shown. What is the diagnosis?