Keith David Palmer, (3 October 1968 – 22 March 2017) was a British police officer who was posthumously awarded the George Medal, the second highest award for gallantry "not in the face of the enemy". Though unarmed, he stopped a knife-wielding terrorist from entering the Palace of Westminster during the 2017 Westminster attack; he died from wounds he received in this attack. He had worked for the Metropolitan Police Service (MPS) for 16 years, and had joined the MPS's Parliamentary and Diplomatic Protection Group in April 2016.