Myocardial Infarction? Not even close.
Okay, so the patient collapsed, had slight atheroma, was a smoker, and had a high blood cholesterol level. These four things do not a myocardial infarct make, though the last two are important increased risk factors for some form of cardiac problem. However, a lumbar puncture on an MI case would definitely not show the presence of any bacteria; this is the crucial thing here.
Go back and look at the CNS report and see if that rings any bells...