A fatal stabbing occurred at Maryvale High School in Phoenix on August 19, 2025, resulting in the death of 16-year-old student Michael Montoya II. The suspect, 16-year-old Chris Aguilar, has been charged as an adult and made his first court appearance. Court documents have revealed possible motives for the attack, prompting concerns about campus safety among parents and the Phoenix Union High School District. Following the incident, students transitioned to remote learning but have since returned to in-person classes as the district evaluates and implements new safety measures. A vigil was held at the school to honor Montoya, attended by hundreds of community members. The medical examiner officially ruled the death a homicide. The Phoenix Union High School District is continuing to address security questions raised by the incident.