Mother was killed by Lanza in the home they shared-—prior to him driving to the school.
Mother’s connection to school is still not known to a certainty. She may have been a teacher’s aide or a substitute teacher, but if so, it is odd that no fact has been established. Also heard that she worked there in the past.
See this thread for recent update and speculations.
http://www.freerepublic.com/focus/f-news/2969044/posts
Thanks, thouworm.