Answer
Stroke, a sudden interruption of blood flow to the brain, was the cause of Lee Kuan Yew's death. This disruption can severely damage brain tissues, resulting in impaired functionality. Strokes are usually categorized into ischemic, caused by a blockage in the blood vessels, or hemorrhagic, caused by bleeding in the brain. Prompt medical attention is crucial as it can mitigate the extent of the damage and enhance recovery prospects.