According to his attestation papers dated August 7, 1917 at Toronto Christopher Holdenby, Mimico, Ontario was born on November 5, 1890 at Islington, Ontario. He listed his mother, Mary Ann Holdenby, Mimico, Ontario as his next of kin. He was a plasterer and had no previous military experience. He was 26 years and 8 months of age and stood 5 feet 8 inches tall. He had brown eyes and hair and a medium complexion. He had an enlarged left ankle. He was Presbyterian.
He was a Sapper in the Canadian Enginees, Railway Depot when he was died on February 25, 1919 from influenza in the 2nd Scottish General Hospital in Edinburgh. He is buried in the Edinburgh (Comely Bank) Cemetery, Scotland. The Commonwealth War Graves Commission website indicates that he was the son of George W. and Mary A. Holdenby, of Mimico, Ontario.