Strokes come in two forms, embolic or hemorrhagic
About 80% are embolic, meaning a clot forms and blocks a vessel in the brain, the downstream brain tissue dies as a result of lack of blood.
A hemorrhagic stroke is when a blood vessel in the brain ruptures. Down stream blood can become unavailable as well due to clot formation, and the pressure that builds up from the bleeding also causes problems.
I am sorry about your father.
Thank you, but at 93 he had a good long life.