CARIBOU — Lawyers for a Maine man sentenced to three life terms for killing two adults and a 10-year-old boy have filed a notice of appeal.

Thayne Ormsby was convicted in the 2010 stabbing deaths of 55-year-old Jeffrey Ryan, his 10-year-old son, Jesse, and family friend Jason Dehahn at Ryan’s home in the small northern Maine town of Amity.

Jurors rejected Ormsby’s insanity defense.

The Bangor Daily News says the notice of appeal and application to appeal the sentence were filed late last month in Caribou.

Ormsby’s attorneys contend he didn’t understand that what he was doing when he committed the murders. Ormsby told police he wanted to kill the elder Ryan because he thought the man was a drug dealer and that the others were killed to eliminate witnesses.