A 17-year-old girl is now facing first-degree murder charges in the January stabbing death of a University of Calgary student.

Police say Brett Wiese was at a house party Brentwood when a number of strangers arrived.

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Brett Wiese, a 20-year-old business student at the University of Calgary, died after being stabbed at a house party in northwest Calgary. (Courtesy of the Wiese family)

The party was advertised using social media and as many as 100 people showed up.

The 20-year-old business student asked them to leave, but police say the group came back with more people — some equipped with knifes — looking for a fight.  

Weiss was fatally injured while another person was seriously injured.

A 17-year-old girl was initially charged with second-degree murder, but it was upgraded to first-degree murder today.

Mitchell William Harkes, 19, was also charged with second-degree murder in the case.

His preliminary hearing is now underway.