During the German occupation of Norway, Morset and his family helped refugees to flee to Sweden. Chairing the local chapter of the teachers" union Norges Lærerlag, he was also the local representative of the teachers" civil resistance. His resistance group was infiltrated by Henry Rinnan"s agents, and Morset was arrested, sentenced to death and executed at Kristiansten Fortress in Trondheim in 1943.
The fate of Morset and his family was treated by journalist Per Hansson in his 1963 book – og tok de enn vårt liv.