The State Fire Marshal’s Office is investigating fatal fires in Harpswell and Old Orchard Beach over the weekend.

The first fire was reported around 12:40 a.m. Sunday on Sea Mist Lane in Harpswell, where one male was found dead inside.

The medical examiner is working to identify the victim.

Investigators were later called to a home at 9 Usen Lane in Old Orchard Beach around 9:30 a.m. Sunday to find 70-year-old John Chadbourne dead at the scene.

The cause of both fires is still under investigation.