( KTRS ) The family of a St. Louis jail inmate who died in custody is disputing the police version of what happened.

Police say 27-year-old Nicholas Gilbert died Tuesday evening after a struggle with officers who tried to prevent him from hanging himself in a holdover cell. Police Chief Sam Dotson says Gilbert hit his head on a concrete bench during the struggle. Officers noticed he was having trouble breathing and called EMT’s. Gilbert was rushed to a hospital, where he was later pronounced dead.

His mother, says Nicholas was not suicidal. Dotson says the investigation is ongoing.