Austin Boutain was taken into custody without incident at a public library, said Detective Keith Horrocks of the Salt Lake City Police Department.
Boutain and his wife, Kathleen Boutain, 23, are also wanted in an investigation of a homicide in Golden, Colorado, according to police there.
The Salt Lake Tribune newspaper, citing police, reported that the couple was camping in the mountains just outside the city and that Kathleen Boutain had gone to the university campus to report that her husband had assaulted her. Guo was killed shortly afterward, the newspaper reported.
That death is being investigated as a homicide and the Boutains are suspects, the Golden Police Department said in a statement.
A pre-computer science student and peer adviser in the school’s International Student and Scholar Services Office, Guo also was an interpreter and technology supporter at the Salt Lake City-based Church of Jesus Christ of Latter-day Saints, according to a social media profile.