The man – who police described as being in a critical condition at a hospital in New Jersey – was identified as Walter J. Blucas, whose son is married to Haddon’s daughter.
Records show the home is owned by Haddon’s daughter, former journalist Ryan Haddon, and her husband, actor Marc Blucas, according to the BBC’s US partner, CBS News.
A preliminary investigation found that a faulty exhaust pipe on the building’s heating system caused the leak, police said.