Philadelphia Fire Department medics were called to a home in the 4000 block of Teesdale Street around 10:35 a.m. Friday for an unresponsive man in the basement.
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Police Commissioner Danielle Outlaw said at an afternoon news conference that the man is believed to be about 30 years old.
He was pronounced dead at the scene.
Officials provide update on hazmat situation in Mayfair
A white, powdery substance was found on the man and throughout the basement, Outlaw said. At this time, the powder is believed to be fentanyl.
"As soon as they saw what they thought was a hazardous materials incident, they called in additional resources," said Fire Commissioner Adam Thiel. "We have upwards of 50 Philadelphia Fire Department personnel here."
A 22-year-old woman and a 6-month-old baby were taken to Jefferson Torrsedale Hospital for treatment.
Outlaw said that at one point the woman became unresponsive in the presence of medics, but they were able to revive her with Narcan.
The scene played out in front of concerned neighbors.
"We seen one of the firefighters holding the baby with a blanket, and it got really emotional," said one neighbor.
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A number of police officers, firefighters and medics were decontaminated due to possible exposure.
No injuries have been reported among city personnel, Outlaw said, though one police officer was taken to the hospital as a precaution.
A criminal investigation is now underway.
Philadelphia police, fire crews respond to hazmat situation in Mayfair
Outlaw said it's not yet known if the suspected fentanyl was for personal use or if this was for distribution.
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"The entire thing is unsettling," Outlaw said.
Police do not yet know if the three people involved are related.
Some streets in the area were shut down for the massive emergency response.
Stay with Action News and 6abc.com as this story develops.