Brazilian police admitted yesterday that they were baffled by the apparently motiveless killing of a Shell executive found battered to death in bed beside his severely injured wife. Todd Staheli, 36, Shell’s director for gas and power in the Southern Cone region, was found by the couple’s 10-year-old son on Sunday morning in a high-security housing condominium in Rio de Janeiro, according to a police spokesman, Ricardo Linck. Mr Staheli, from the US, had suffered blows to the face and head and was pronounced dead on arrival at hospital. His American wife, Michelle, 34, also suffered severe head injuries, and underwent emergency brain surgery after falling into a coma. Her condition was critical yesterday. Full Story