A 17-year old pupil who stabbed and killed his 24-year-old maths teacher in his classroom in Zeerust is expected to be sentenced today. The teenager pleaded guilty to murder charges. The teacher, Gadimang Mokolobate died at a local clinic after the stabbing. Last week a parent assaulted a school teacher with an umbrella in Tlhatlhaganyane and this week a 14-year-old Grade 5 learner was stabbed to death with a pair of scissors at Atamelang. North West MEC for Education and Sport Development Sello Lehari said his department will convene a seminar next week that will deal with School Safety.