A well-known climate change expert and professor at the University of Minnesota choked and brutally assaulted his fiancée, who told cops she fears he will kill her, according to a criminal complaint.

Aaron Herbert Doering, a 47-year-old tenured professor and the director of the Minneapolis university’s Learning Technologies Media Lab, was charged Thursday with two felony counts of domestic assault by strangulation in Hennepin County District Court, the Star Tribune reports.

Doering — who also serves as a fellow for the Royal Canadian Geographic Society and regularly appears on media outlets to discuss climate change, sustainability and related topics — had to be separated from his fiancée by responding officers when they got to the couple’s apartment in Minneapolis, according to a criminal complaint obtained by the newspaper.

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The woman, who had bruises on her neck and red marks on her forehead, told police Doering had dragged her through the apartment by her hair before beating her and choking her to the point that she thought she would lose consciousness, the complaint shows.

“Victim believes [Doering] will kill her if he returns to the apartment,” according to the court document.

Click here to read more from the New York Post.