Orlando Harris also left behind a handwritten note offering his explanation for the shooting Monday at Central Visual and Performing Arts High School, St. Louis Police Commissioner Michael Sack told reporters.Tenth-grader Alexzandria Bell and 61-year-old physical education teacher Jean Kuczka died and seven students were wounded before police killed Harris in an exchange of gunfire.Several people inside the school said they heard Harris warn, “You are all going to die!” Crime, Trump center stage in sole New York governor's debate Police chief in Virginia capital city resigns amid scrutiny Michigan jury gets case against 3 men tied to Whitmer plot Maine man appeals convictions, sentences in Alaska murder Harris graduated from the school last year.Sack, speaking at a news conference, urged people to come forward when someone who appears to suffer from mental illness or distress begins “speaking about purchasing firearms or causing harm to others.” Alexzandria was a bright, charismatic girl with a sassy personality who was working hard to improve her dancing and her grades, said Central’s principal, Kacy Seals-Shahid.“The family was super supportive of Alexzandria.” Abby Kuczka said her mother was killed when the gunman burst into her classroom and she moved between him and her students."