Looks like the stroke was a complication from a systemic MRSA infection, which would not be my assassination agent of choice if I was trying to kill somebody on purpose, even if I did want it to look like an accident. MRSA only kills about 1 in 4 people infected with it, and many of those are people who are already hospitalized for some other serious illness. It strikes me as a rather low-probability way to kill a healthy adult.