The video shows Aaron Ybarra entering a building at Seattle Pacific University and holding a shotgun. He points it at two people and shoots and injures one student.

Jon Meis then runs into the lobby and confronts him, dragging him to the ground and taking the shotgun.

Police say Ybarra killed one male student outside the building.

Ybarra's defense attorney has not disputed accounts of the shooting, but says Ybarra suffers from mental illness.