The family of a college student who was fatally shot by a Chicago police officer has amended a lawsuit to label the shooting a hate crime. The lawyer for the father of 19-year-old Quintonio LeGrier says the personal texts of Officer Robert Rialmo showed racial bias.

The Chicago Tribune reports that Rialmo’s attorney says the allegations of racism are “stupid and irresponsible.”

Copies of Rialmo’s text conversations were released by his attorney. One contained racial slurs used by Rialmo’s friend in the days before LeGrier’s shooting.

Rialmo was responding to a 911 call for helf when he fatally shot LeGrier, claiming the student was coming at him with a bat. The officer also shot and killed a neighbor in what police said was an accident.