Court documents are shedding more light on what led to a deadly stabbing at a Phoenix-area school earlier this week.

Maryvale High School was one of two Phoenix Union High School District schools to pilot an advanced weapons detection system.

A student was stabbed to death and his alleged attacker was hospitalized after the two teen boys got into an argument inside an Arizona high school classroom just two weeks into the school year — sending students and their parents into panic mode.