Vladimir Katriuk, a Ukrainian-born beekeeper and former butcher who was No. 2 on the Simon Wiesenthal Center’s list of most wanted Nazi war criminals, died this month in a hospital in Salaberry-de-Valleyfield, Quebec, near where he lived. He was 93.

The cause was a stroke, his lawyer, Orest Rudzik, said.

Mr. Katriuk died just two weeks after Moscow demanded his extradition, which the Canadian government, vexed by Russian aggression in Ukraine, frostily rebuffed. On Thursday, before Mr. Katriuk’s death became public, Canada’s Center for Israel and Jewish Affairs urged Ottawa to review the case and to “take the necessary steps to ensure that, if guilty, Katriuk be held accountable for war crimes committed in collaboration with the Nazi regime.”

The Russians had accused Mr. Katriuk of genocide in connection with the 1943 murder of civilians in Khatyn (not to be confused with the Katyn Forest in Russia in 1940, where the Soviets massacred Polish officers), in what is now Belarus.

At the time, Mr. Katriuk was a sergeant in a Ukrainian battalion attached to Nazi storm troopers who rampaged eastward in a brutal campaign against Soviet partisans, overrunning villages like Khatyn. The troopers were accused of herding nearly 200 civilians into a barn in Khatyn, burning them alive and machine-gunning those who tried to flee.