Roger Ailes died of a subdural hematoma, a type of brain bleed. This is a condition that occurs when blood collects between the skull and the brain, and it can be caused by a number of factors, including trauma, aneurysms, and strokes. In Ailes's case, it is believed that the hematoma was caused by a fall he suffered at his home.
The Influential Legacy of Roger Ailes: Test Your Knowledge on the Mastermind behind American TV