Task: Question Answering
Input (English): Passage: A group of ten people, strangers to one another, have all travelled to a hotel located deep in the deserts of Iran. Upon arrival they discover that their host is mysteriously absent. At dinner, they notice a display of figurines; the Ten Little Indians, as represented in the doggerel in each of their suites. They are accused via a tape recording by the host, U.N. Owen ("unknown"), someone none of them has ever met, of having committed various crimes in the past which went unpunished by the law.
One by one, the guests start to die; first Michel Raven whose drink was poisoned. During the night, the housekeeper/cook, Elsa Martino, makes a mad dash to escape, only to be strangled against a pillar; a method of Ancient Persian execution, as noted by Hugh Lombard. A search of the hotel is intimated by General Salve who splits everyone into pairs. Not long after everyone separates from each other, Salve is stabbed to death in the hotel's catacombs. Their search reveals there is no one in the desert, except their seven selves, and that there is a killer in their midst who is one of them. 
The next morning, Elsa's husband, the butler, attempts to escape into the desert, only to expire from heat and exhaustion; his survival kit having been sabotaged. Ilona reveals her tragic past to the others, exposing the cause of her husband's suicide. Later, she is found dead, bitten by a venomous snake. The lights soon short out, leaving the five remaining guests in the dark, where at dinner, they reveal the nature of the crimes they stand accused of. Before Vera can offer her explanation, she leaves the others to return to her room. She screams, and the others rush to her. In the confusion, Judge Cannon is found dead in his bedroom, shot in the head. 
Question: What is the profession of the person who was made a widow after Elsa was strangled to death?
Output (English): butler.