Prior to the school shooting , Lanza murdered his mother .
At approximately 9 : 30 a.m. t , 20 - year - old Adam Lanza fatally shot twenty school children and six school employees prior to committing suicide .
Prior to the school shooting , Adam Lanza murdered Adam Lanza 's mother .
At approximately 9 : 30 a.m. t , 20 - year - old Adam Lanza fatally shot twenty school children and six school employees prior to committing suicide .