In December 1933, the Polish court in Lviv sentenced Lemyk to death, which was later commuted to life imprisonment.[2] At the outset of World War II in 1939 Lemyk was freed from jail, and on 4 August 1940 he married Liuba Vozniak.
From 1941 Lemyk was in the regional command of the OUN-B — the faction supporting Stepan Bandera, in Eastern Ukraine. In the fall of 1941 he led the Central Committee of the OUN. In October 1941 Lemyk was arrested by the Gestapo in Myrhorod (which was then occupied by Nazi Germany), and shot[2] (other sources state that he was hanged by the Gestapo[1]).