Former Ramotshere High School learner who killed his maths teacher will spend 10 years behind bars. The 17 year-old teenager was sentenced in the Lehurutshe regional court today. Handing down sentencing, magistrate Winnie Malane said the teenager did now show any remorse. Gadimang Mokolobate (24) was stabbed to death while he was in class last year following an argument with the teenager.