He married Louisa Mary Murphy on 1 January 1925, and later that year the couple settled in the United Kingdom.
Walsh was to remain there until his death in 1952 in Western-Super-Mare, Somerset, England.
[1] Walsh was a very prolific writer, producing around 94 novels, across a range of genres (mystery, crime, war, thriller, adventure and science fiction) under a number of pseudonyms.
[2] In addition to his novels Walsh also wrote a number of short stories, and books for children.
[2] From 1938 Walsh lived at Weston-super-Mare, Somerset, where he died on 29 August 1952.