LOS ANGELES - The 24-year-old son of O.J. Simpson defense attorney Robert Shapiro died at a hospital after being found unconscious, and the coroner's office said he had tested positive for amphetamines. Brent Shapiro, a University of Southern California graduate who had just enrolled in law school, died Monday. He had been found unconscious the morning before. Officials at Cedars-Sinai Medical Center Hospital told the coroner's office that Shapiro had tested positive for the drug, said Lt. David Smith, a coroner's office spokesman. "It's being considered an accidental death," he said. An official ruling on cause of death will be...