The Ontario Fire Marshal has been on scene all day Friday investigating what caused a house in Woodstock to go up in flames, claiming two lives.

Heavy equipment was brought in to remove what was left of the roof of the home at 482 McQueen Street to make the structure safe enough for investigators to enter.

“At this point, we don’t know what the cause of the fire is,” Office of the Fire Marshal investigator Jeff Rebby told CTV News.

“We have to tear the structure down to examine it thoroughly, and that’ll take us a couple of days.”

Three people were inside the home when the blaze broke out around 6:30 a.m. Thursday. Only one person escaped.

The names have not been released but the deceased are believed to be an 80-year-old woman and a 56-year-old man.

The man was rescued by firefighters but later died in hospital. The woman's body was finally found Friday morning after heavy debris was removed.

The cause of the fire remains under investigation, “There was a lot of damage to the structure,” Rebby said.

However, the cause of the fire is not believed to be suspicious.