The Belfast man accused of shooting and killing a mother and injuring her son is now pleading guilty to the crime.

Todd Gilday, 44, was charged with fatally shooting 55-year-old Lynn Arsenault, who formerly went by Lynn Day. Gilday was charged with murder in connection with Arsenault's death and with elevated aggravated assault for shooting and wounding 22-year-old Matthew Day, who is Arsenault's son.

Gilday originally pleaded not guilty by reason of insanity to the charges but changed his plea to guilty Monday, July 21.

His sentencing is scheduled to take place Aug. 20.

According to previously published reports, on Aug. 28, 2013, Gilday forced his way into the 162 Waldo Ave. home of Mathew Day, 22, of Belfast. Gilday shot and killed Arsenault, before shooting and wounding Day.

When officers entered the home through a back door, Maine State Police Detective Ryan Brockway said in his affidavit, police could see a broken window with a fist-sized hole in the glass. Officers also observed a male subject lying across a female subject on the floor of the kitchen area.

The male subject, later identified as Day, was able to talk to police and identify Gilday by name as the shooter. While talking to Day, Belfast Police Sgt. Brian Lunt discovered several unfired shotgun shells and bird shot on the kitchen floor, according to the affidavit.

Police learned Gilday came to the door of the home and was met by Day. "The door opened partially before Day attempted to close it, at which point the glass was blown out of the door and the door was kicked in,” according to previously published reports.

Police eventually located and arrested Gilday at Pen Bay Medical Center in Rockport the morning of Aug. 29.