 He also helped refugees.When the Nazi police leader Karl Marthinsen was assassinated by the Norwegian resistance on 8 February 1945, Vislie was arrested together with thirty-three others, including Carl Ferdinand Gjerdrum, Haakon Sæthre and Kaare Sundby, as a reprisal.Vislie was immediately convicted by a court-martial, and executed on Akershus Fortress on 9 February.