The Ontario Fire Marshal's office is trying to determine the cause of a fire that killed a 56-year-old man in Leeds County, southwest of Ottawa.

The body of Clifford Robert Smith was discovered in a burning home on Main Street in Seeley's Bay, in Leeds and the Thousand Islands Township, near Kingston.

The home was fully engulfed in flames when firefighters arrived at 4:30 p.m. Sunday. A post-mortem on the man's body was conducted on Monday.