AMHERST, N.H. — A man who fatally shot his mother, then himself last year, had threatened to kill himself before and had struggled with alcohol and prescription drug addiction, Attorney General Joseph Foster said in a report released Thursday.

Authorities said John Trombly of Amherst, New Hampshire, 35, shot his mother, Elizabeth Trombly, 69, multiple times before shooting himself on Sept. 14, 2014. The bodies were discovered in their home. The report said six loud bangs were heard at the house that morning. John Trombly then went out to buy cigarettes and alcohol at two stores before returning home and killing himself. His blood-alcohol level was .327, over four times the legal limit.

Foster’s report said John Trombly had struggled with alcohol and prescription drugs following gastric bypass surgery about seven years before his death. He went for treatment several times, including after a May 2014 incident where he made suicidal threats with a gun while heavily intoxicated. That July, paramedics were called twice to the house for incidents involving his excessive drinking, both of which resulted in his hospitalization. He also had been arrested on a charge of possessing a concealed firearm.

The report says two days before the shootings, Trombly’s mother dropped him off at the Farnum Center, an alcohol and drug treatment facility. He called his friend from a restaurant later and told him the center would not let him in.