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.

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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.