Today in history: On Feb. 14, 2018, a gunman identified as a former student opened fire with a semi-automatic rifle at Marjory Stoneman Douglas High School in Parkland, Fla., killing 17 people in the nation’s deadliest school shooting since the Sandy Hook Elementary School attack in Newtown, Conn., more than five years earlier. (Nikolas Cruz pleaded guilty to murder in October 2021 and was later sentenced in November 2022 to life in prison without the possibility of parole.) Also on this date: