William Marcel McNeill arraigned on manslaughter charge, accused of giving woman fatal amount of fentanyl Updated 10:29 AM; A Dorchester man has been charged with manslaughter, accused of giving a 23-year-old woman a fatal amount of fentanyl in 2019, officials said Saturday. William Marcel McNeill, 34, was located and arrested by Boston police on Friday morning. He was then arraigned in Brockton Superior Court on charges of manslaughter and unlawful distribution of a Class A substance (fentanyl). McNeill pleaded not guilty and bail was set at $200,000 cash, according to a statement from the office of Plymouth District Attorney Timothy Cruz. The woman, whose name was not publicly released, was living in a residential rehabilitation facility and fatally overdosed on Jan. 28, 2019, the statement said. Detectives assigned to the district attorney’s office helped Plymouth police with the investigation.