According to court documents, Julius Delick, 81, was killed in the blaze. He was found in a second-floor bedroom. His wife, Phyllis Drelick, 85, survived.
Neighbors said there was little they could do once they realized what was happening.
“We came out later and the place was burning and that was all we saw. All the emergency personnel were here already,” said Bill Dominick.
The Bucks County District Attorney plans to announce the charges against Gillie in a news conference Monday afternoon.
Officials said crews had difficulty battling the blaze due to the lack of access to water.