Martinsville firefighters are investigating the cause of a deadly house fire Thursday morning. Firefighters responded to a report of a house fire in the 900 block of South Grant Street, near South Ohio and East Gray streets, around 2 a.m. April 3. When firefighters arrived, they found the home on fire and immediately started attacking the fire. MORE: https://www.wthr.com/article/news/local/1-dead-1-critical-house-fire-martinsville-south-grant-street/531-772890fb-fb63-4a23-add5-ec2f22ba207b