John Nash, the famed Nobel Prize-winning mathematician who inspired the film A Beautiful Mind, died Saturday in a taxi crash on the New Jersey Turnpike. The 86-year-old Nash and his wife, Alicia, were both killed when the driver of their taxi lost control and slammed into a guardrail. Police said they believe neither Nash nor his wife, who were ejected from the vehicle, were wearing seatbelts at the time of the accident.