BOSTON (AP) — A grand jury has been convened in Massachusetts to hear evidence in the 1986 shooting death of the brother of a former university professor who is accused of killing three colleagues in Alabama. John Polio, a retired Braintree police chief, said Friday that he and his wife, who worked in an administrative position in the Police Department, had been subpoenaed to testify this week before a grand jury that is investigating the case against the professor, Amy Bishop. A spokesman for the Norfolk County district attorney’s office would not comment. Ms. Bishop, who lived with her family...