Could not find obit for Helena but did for Roland Isaac Ritchie who died 04 Feb 1955 at age 62 in Deer Lodge Hospital. He was survived by two sons, Kenneth and Gerald, two brothers Robert and Rufus, one sister Edith. [Winnipeg Free Press, 1955 Feb 07]
No mention of Helena.
He is buried at Brookside Cemetery:
Ritchie Roland Isaac 45557 MLTY-3948-0 2/4/1955 2/8/1955