Acute myocarditis is a rare complication of Escherichia coli urinary tract infection and sepsis. We report the case of a previously healthy 55-year-old female who presented to our emergency department with diarrhea and hypotension. The basic metabolic panel results showed an increase in inflammatory markers and an acute kidney injury. Urine and blood cultures grew Escherichia coli. The patient subsequently developed sudden chest pain and shortness of breath, diffuse ST-segment elevation, and cardiac enzymes' elevation. Coronary angiogram was normal, and transthoracic echocardiogram demonstrated normal ventricular functions. Cardiac magnetic resonance imaging was highly suspicious of myopericarditis. The patient made a full recovery after infection treatment with intravenous antibiotics, aspirin, and colchicine.