Tom Sizemore's cause of death was Intracranial Aneurysm. An intracranial aneurysm, also known as a cerebral aneurysm, is a cerebrovascular disorder in which weakness in the wall of a cerebral artery or vein causes a localized dilation or ballooning of the blood vessel.
Tom Sizemore Mind Meld: 15 Questions to Test Your Mental Fusion