A new spire was added around 1825, paid for by Lord Dufferin. There are records of the church being closed for four months in 1859 as open pews had been installed. Gas lighting was installed by John Martin of Shrigley in 1866. He came to Killyleagh from Pott Shrigley in Cheshire and created a respected model village for his mill workers in Shrigley, about a mile from Killyleagh.