Court records released Thursday say a student told detectives that Michael Hernandez, 14, told the teacher he "got pushed by people and he got a bloody nose," The Miami Herald reported Friday.
Circuit Judge Henry Leyte-Vidal has scheduled a competency hearing for Aug. 19 to determine whether Hernandez can stand trial for the slaying of Jaime Gough, also 14.
Gough's throat was slashed in a boy's restroom at Southwood Middle School Feb. 3.
Hernandez is charged as an adult and if he is convicted will serve a mandatory sentence of life in prison.
Defense attorney Richard Rosenbaum told the judge this week that "Hernandez is mentally ill and not competent for trial.
Two court-appointed specialists have already determined the boy is competent to stand trial.