ARDMORE, Okla. (KTEN) -- Ardmore firefighters are investigating the cause of a Thursday morning house fire that claimed one life.

The blaze was reported shortly after 9 a.m. in the 400 block of G Street SE, near Hardy Murphy Coliseum.

"We got here in about four minutes," said Ardmore Fire Department spokesperson Jason Woydziak. "Firefighters arrived on scene to find heavy smoke coming out of the house. We did make entry; upon that time we did come across a victim who had already succumbed to injuries from the fire."

First responders found an adult dead inside the 1,200 square foot home that was was built in 1945. The victim's name was not released. Family members said it was their 95-year-old grandfather who died in the fire.

Police said there was no evidence of criminal activity.