Lauren Rousseau had only been a full-time substitute teacher at Sandy Hook Elementary School for about three months when a gunman went through the school, killing 20 elementary school students and six staff members on Friday.
NBC Connecticut spoke with Rousseau's family, who confirmed that she died at the school.
The 30-year-old Danbury woman loved teaching, according to her family.
The Danbury News Times reports that Rousseau went to the University of Connecticut, then earned a master's degree from the University of Bridgeport.