I'm sure I found the lyrics to this once in "The Penguin Book Of Canadian Folksongs", but can't lay my hands on it at the moment to check. I first heard the song sung by Mick Hanly on his 2nd solo album "As I Went By Blackwaterside", and thought it a great song, one of several on that record. The only other time I came across it was when it was recorded by the American/Irish group "Touchstone", but I've a feeling they might have got it from Mick Hanly.
I've just had a look on iTunes - there are 15 recordings of a song called "Jack Haggerty", including "Touchstone's" version, but unfortunately not Mick Hanly's.