Who was Josslyn Hay Earl of Erroll and why was he murdered?

On the morning of January 24, 1941 the body of Josslyn Hay, the Earl of Erroll, was found shot in the head, in a car outside Nairobi near Happy Valley, an upper-class enclave of English residents living in Kenya during WWII. One suspect was tried but aquitted until years later when a writer, James Fox, revived the cold case and solved the mystery. The killer was Sir Jock Delves Broughton. Broughton's estranged wife was involved with Hay and there lies the motive. He was brought to trial but was aquitted of the crime. He never was able to reunite with his wife and died a lonely, broken man.