28-year-old Kohberger is charged with four counts of first-degree murder and felony burglary. RELATED: Idaho stabbing suspect mentioned 'mass shooting' during traffic stop https://youtu.be/-U-XBvWnbGw A roommate in the house where four University of Idaho students were stabbed to death in November told authorities she saw a tall, masked man in black inside their home at the time of the early morning attacks, according to newly released court documents Thursday. Police said they zeroed in on suspect Bryan Kohberger, 28, through a combination of DNA evidence left on a large knife sheath found at the scene, trash collected from his parents' Pennsylvania home, surveillance video, cell phone records and license-plate readers that tracked his car on a cross-country drive. » Subscribe to USA TODAY: http://bit.ly/1xa3XAh » Watch more on this and other topics from USA TODAY: https://bit.ly/3GK6b78 » USA TODAY delivers current local and national news, sports, entertainment, finance, technology, and more through award-winning journalism, photos, videos and VR. #bryankohberger #idahostudents #murder