Benjamin LaMontagne, who died at his home in February four days after wisdom tooth extraction, was killed by a tissue infection of his gums, neck and jaw... after routine oral surgery, was killed by a rare, aggressive bacterial infection that caused swelling of his jaw and neck, according to the state Medical Examiner’s Office. The medical examiner’s report, released Thursday to the Portland Press Herald in response to a public records request, lists the cause of death as cervical necrotizing fasciitis, commonly called “flesh-eating bacteria.” The infection is caused by a powerful strain of streptococcus A, a group of pathogens...