HAVERHILL, N.H. — Lawyers for a man accused of killing his mother in a New Hampshire hospital intensive care unit say the man suffered from "delusional beliefs," and they may seek an insanity defense.

Valley News reports lawyers for 49-year-old Travis Frink wrote in court documents that he told police he was taken from the womb of his birth mother and subjected to a "sadistic scientific experiment."

Frink also told police he had not taken any medication and had not slept in a long time before the September 2017 shooting that killed 70-year-old Pamela Ferriere.

Authorities say Frink shot his mother multiple times at Dartmouth-Hitchcock Medical Center in Lebanon.

Court records show Frink had been hospitalized before the shooting and diagnosed with bipolar disorder and schizoaffective disorder.

He has pleaded not guilty.