Why did Sofie Magdalene Dahl die?

Sofie Magdalene Dahl, the first wife of Roald Dahl, died due to a cerebral aneurysm on November 17, 1967. A cerebral aneurysm is a bulge or ballooning in a blood vessel in the brain that can rupture and cause a hemorrhagic stroke. In Sofie Magdalene Dahl's case, the rupture of the aneurysm led to her untimely death at the age of 39.