The blaze broke out at early Thursday morning at a home in the unit block of Township Line Road, near Butler Pike.
The fire department was alerted at 2:10 a.m. by a neighbor and a passing driver.
Fatal fire overnight in Whitpain Twp. Man in his 50's pronounced dead on the scene. pic.twitter.com/8wdlGWqNTS— Katherine Scott (@KScott6abc) May 4, 2017
When firefighters arrived, heavy flames were tearing through the home, and they were told an occupant might still be inside.
They worked to extinguish the flames in order to get inside to search.
Four people live at the home. Three of them were out for the night.
The fourth, a man in his 50s, was found in the home.
"Unfortunately, through all the debris and rubble, when the occupant was found, it was obvious he was deceased," said Whitpain Twp. Fire Marshal David Camarda.
Update: Red Cross volunteers providing care and comfort for three people after a fatal fire in Whitpain Township, Montgomery County.— Red Cross Philly (@RedCrossPhilly) May 4, 2017
Investigators believe the blaze began in the master bedroom.
A working smoke detector was found in the home, but it's unclear if there was one near the bedroom. The fire does not appear to be suspicious.
"The damage is extensive on this side of the home," said Camarda. "Smoke damage throughout.... The attic is pretty well destroyed as well."
Neighbors couldn't believe what happened.
"There's a fire truck there, a fire truck there, fire truck there," said Jack Caldwell, who walked outside his house shortly after firefighters arrived. "And they just kept saying, 'The corner house!'"
Volunteers from the Southeastern Pennsylvania chapter of the American Red Cross are "providing care and comfort" for the three family members who were not home.
Investigators remain on the scene working to determine what sparked the blaze.
Send a breaking news alert
Report a correction or typo
Learn more about the 6abc apps