PORTLAND — Maine’s highest court has scheduled an appeal date for a man serving a life sentence for killing two adults and a 10-year-old boy in northern Maine.

Thayne Ormsby’s appeal will be heard by the Maine Supreme Judicial Court on Sept. 9. The 23-year-old Ormsby was given three life sentences in the 2010 stabbing deaths of 55-year-old Jeffrey Ryan, his 10-year-old son and a family friend at Ryan’s home in the small town of Amity.

Ormsby’s lawyers are claiming his Miranda rights were violated by police during questioning and that his confession was involuntary. They further claim the judge erred in denying a motion to change the location of the trial.

Ormsby grew up in Ellsworth, but was living in the small town of Orient at the time of the killings.