In the novel Evil Under the Sun, Kenneth Marshall was the husband of Arlena Marshall. He is the father of Linda Marshall. He is about 38 years old.

Rosamund Darnley, a childhood friend of his, claimed that Ken was a fool when it came to love. His first wife had been put on trial, accused of poisoning her then husband with arsenic. After she had been acquitted, Kenneth married her. She died at childbirth a year later, when Linda was born.

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