Twenty children and six adults were killed during a shooting at Sandy Hook Elementary School in Newtown, Conn., in one of the deadliest school shootings in U.S. history. Charlotte Bacon. Charlotte Bacon, 6, was among the 20 students killed when a gunman opened fire at Sandy Hook Elementary School in Newtown, Conn. Daniel Barden. Daniel Barden, 7, was among the 20 students killed when a gunman opened fire at Sandy Hook Elementary School in Newtown, Conn.