Former Nazi death-squad member Helmut Oberlander has died in the midst of a decades-long deportation battle with the federal government, prompting Jewish rights organizations to express frustration that his legal saga never reached completion. Oberlander’s family said Thursday that the 97-year-old died peacefully while surrounded by loved ones. The federal government had stripped Oberlander of his citizenship several times—revocations he repeatedly fought in court. Earlier this month, the Immigration and Refugee Board of Canada began a hearing on whether he could remain in the country or be returned to Germany. His lawyer, Ronald Poulton, sought a stay in those proceedings, partially due to Oberlander’s declining physical and mental health. The decision maker in the case adjourned proceedings to consider the application, but didn’t set a date for her finding. Michael Levitt, president of the Canadian Friends of Simon Wiesenthal Centre for Holocaust Studies, said there was a “great sadness justice …