When did winson churchil die?

First of all his full name is 'Winston Leonard Spencer Churchill'. Note the spelling, and the names.

He died on the 24th January 1965 in London. of a stroke (Cerebral vascular accident).

He is buried(interred) at Bladon parish church in Oxfordshire, near his (Churchill's) ancestral home of Blenheim Palace.

John Churchill was the 1st Duke of Marlborough, about 1700. The current Duke of Marlborough and his antecedants are his former relatives.