He allegedly shot Bernard Kandler, who had tried to escape from a truck that was taking him to a ghetto; Lusi Rosiner, a fourteen-year-old hiding in a barn, and the four-year-old Monica Singer.
[citation needed] In 1944, fleeing the Soviet advance, Koziy and his family moved to Heide, Germany, where he worked as a farm hand.
Koziy denied involvement in the Ukrainian Auxiliary Police and contended his actions were insufficient to support revocation of his citizenship.
On 21 November 2003, the Polish authorities turned to the government of Costa Rica demanding Koziy's arrest and extradition.
The Costa Rican court granted the deportation order but Koziy died soon after on 30 November 2003, while in hospital in San José, from a stroke.