Kolgrim [SEP] cause of death
Kolgrim's situation worse, since it meant that Kolgrim had "stolen" not only her body, but also her soul, from her husband. 
Kolgrim was found guilty of sorcery and condemned to death by burning at the place of execution at Gardar. After his execution, Steinunn was "never fully sane" again and died soon after. 
Kolgrim in fiction.
Kolgrim and his witch trial are fictionalized in the novel "The Greenlanders" by Jane Smiley.
References.
- Alnæs, Karsten, Historien
settlements by English raiders, and the witchcraft trial of Kolgrim.
Reception.
"The Greenlanders" was reviewed favorably. Kirkus Reviews called it a "bleak, stirring picture of the slow slouch towards the death of a civilization." In a 2010 Time article, American author Jonathan Franzen included it in his list of influential books, and in an interview with Big Think, Franzen said, "I do not know of a better American novel within the last twenty years" than "The Greenlanders".