MACHIAS — Motions filed by the state to try 16-year-old Matthew Day of Bucks Harbor as an adult in the Oct. 29, 1989, shooting death of his mother, Debra Day, will be heard on Sept. 14 by Judge Andrew M. Mead in Ellsworth District Court.

Day was petitioned by the state in August on a juvenile charge of manslaughter in his mother’s death after a 9 1/2-month investigation by the Attorney General’s Office.

The move follows a decision on Aug. 29 in Machias District Court by 4th District Court Judge Douglas Clapp of Bucks Harbor to refuse the case. Clapp, who told the court he did not personally know the youth, cited his residency in Bucks Harbor as cause for refusing the case.

The state also has pending a routine motion asking for a court-ordered psychological examination of Day to determine criminal responsibility, competency and other factors the state will need to know before trials begin.

Day, who was 15 at the time of the incident, was alone with his mother in the family’s Bucks Harbor home when she was killed. He remains under supervised custody of his father, Wade Day.