 The elder son, Marc died of cancer at age 19 in 1976, shortly after Alexander's American wife Lyn died of complications from hepatitis.He died of pneumonia in London on 15 April 1984.The final tragedy was the suicide of the younger son, Nicholas who, some years after his father's death, returned to the family's home in London and leapt from the top floor of the five-storey building to his death.