A Massachusetts man who allegedly piloted the motorboat that struck and killed a Camden woman last summer in Damariscotta Lake has been indicted for manslaughter. Jonathan D. Roberts, 47, of Waban, Massachusetts, was indicted last week by a Lincoln County grand jury in connection with the Aug. 2 death of Kristen McKellar, according to the Penobscot Bay Pilot. McKellar, 32, had been swimming with a friend around dusk when a motorboat approached them, her sister, Alison McKellar, told the BDN in October.