There are two types of stroke:
1. Haemorrhagic (due to a bleed leading to a clot pressing on brain tissue).
2. Thrombotic (due to a small clot in a blood vessel supplying a part of the brain, so that that part dies of lack of oxygen
Due to your Dad having hypertension
, he almost certainly had the first. If the clot is large enough and presses on an important part of the brain, of course it can kill. eg if it affects the medulla oblongata
which controls heart beat and breathing.
Hope this helps. Happy to help further if need be. Please IM me.