One man has died after a fire in Great Mills burned through his living room Wednesday night, authorities said.

 Firefighters from four St. Mary’s County departments found the man when they responded to a neighbor’s 911 call about 11 p.m., authorities said.

The man was in a chair in his living room next to cigarettes and the breathing tube of a home medical oxygen unit, according to authorities. Theoxygen unit itself was in a bedroom, a spokesman for the state fire marshal said.

 Most of the fire was confined to the living room of the two-bedroom apartment. Officials continue to investigate the cause of the fire and the man’s identity.