The bodies of two men were found inside a Clairton home on Saturday.

The victims' families gathered outside a home on Mitchell Avenue to grieve over the sudden death of two life-long friends 56-year-old William Chapman and 47-year-old Gary Townsend.

"I'm not doing too good right now, cause he just came home, and I miss him already," said Shirley Sanders, Chapman's sister.

Sanders said Chapman spent Friday night at her home because he got home from the hospital and the house was ice cold.

Someone was supposed to come out to work on the furnace Saturday morning, but instead his family grew worried when no one could reach him on the phone.

Chapman's sister found him and Townsend dead in the house. Authorities believe they were overtaken by carbon monoxide -- likely from the malfunctioning furnace. Firefighters said their gauges showed a CO reading of 500, which is 50 times higher than what is considered safe.

"We took readings, and it took over an hour for the readings to come down where it was safe for people to go in," said Chief John Lattanzi of the Clairton Fire Department.

The deaths have left two close families in shock. Lattanzi said their deaths should serve as a powerful warning for everyone.

"We can't tell you enough: People should get these CO detectors in their home," he said. "The prices are right. Buy one. It could save your life."