Updated at 12:22 p.m.: Revised to include additional details.

A North Richland Hills man killed his 95-year-old mother and then himself this week in the living room of the home they shared.

Authorities were called to the house in the 4800 block of Wedgeview Drive, near Bedford-Euless Road, by a caretaker around 4:30 p.m. Tuesday. Beatrice Thomason, 95, and James Thomason, 61, were dead in the living room when they arrived.

Both were killed by shotgun blasts to the head; Beatrice Thomason's death was ruled a homicide and her son's was a suicide, according to the Tarrant County medical examiner's office.

Property records show that the Thomasons have owned the house since it was built in 1963. James Thomason ran a business called Beajim Custom Designs from the home.

Police have not released a motive for the killing. There had been no previous police calls to the home, spokeswoman Carissa Katekaru said.