Natalie Rupnow: Police identify Wisconsin school shooting suspect as a 15-year-old female student

A 15-year-old girl has been identified as the student who opened fire at Abundant Life Christian School in Madison, Wis., on Monday morning, police said.

A teacher and a student were killed, and two students remain in critical condition, Police Chief Shon Barnes said in a Monday night press briefing. The suspect, identified as Natalie Rupnow, who also went by the name Samantha, was pronounced dead while being taken to a hospital. Authorities believe she died of a gunshot wound, he said, though the cause of death has not yet been determined by the medical examiner.

A second grader called 911 shortly before 11 a.m., alerting police to the shooting at the school, which teaches students from kindergarten through high school, Barnes said.