Atherosclerosis (as was picked up in this case by the autopsy) is definitely a risk factor for strokes, as well as other problems due to clot formation such as angina pectoris, myocardial infarction. Atherosclerosis is a disease where fatty plaques develop in the walls of arteries, limiting blood circulation and creating turbulent blood flow around the plaque. This predisposes to thrombosis - the formation of a solid mass of blood in a vessel, which can block blood flow where it forms or dislodge and get stuck in a smaller vessel elsewhere - often the brain. Atherosclerosis is very common in Western countries. This is because the causative factors such as high animal fat intake, high refined sugar intake and cigarette smoking are all common.
Have another go, you’re on the right track.