Slezyuk was born on 14 January 1896 in the village of Zhyvachiv, Austrian-Hungarian Empire (now in Ivano-Frankivsk Oblast, Ukraine).
After graduating from the seminary in 1923, he was ordained a priest on 1923 by Bishop Hryhoriy Khomyshyn.
[2] However, shortly thereafter on 2 June 1945, Slezyuk was arrested and deported for ten years to the labour camps in Vorkuta.
The Sisters of St. Vincent, who helped him out, also said that the bishop returned from this 'conversation' with a very red face, he felt exhausted, stayed in bed and died two weeks later.
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