Elmore is accused of shooting school resource officer Erik Clark in the March 4 shooting in the assistant principal's office at Olathe East High School.
KANSAS SCHOOL SHOOTING: SUSPECT DETAINED AFTER RESOURCE OFFICER, ADMINISTRATOR SHOT
Prosecutors allege Elmore, who was a senior at the time, was called to the office when he refused to allow school officials to search his backpack after reports that he had a gun.
A Kansas student allegedly shot a school resources officer at his high school. He pleaded not guilty to charges including capital murder and two counts of criminal use of a weapon.
COPS: KANSAS SCHOOL SHOOTING FOILED AFTER MYSPACE MESSAGES INTERCEPTED
Clark and Elmore shot each other during the scuffle, according to court documents. The assistant principal was hit by bullets "most likely" shot by Clark during the confrontation, investigators said.
Both men survived their injuries and were released shortly after the shooting. Elmore was hospitalized in critical condition for several months.
Elmore's scheduling trial is set for April 10. He is being held on $1 million bond, The Kansas City Star reported.