On 20 August 1940, Trotsky was attacked in his home in Mexico with an ice axe by undercover NKVD agent Ramón Mercader.
The blow was poorly delivered and failed to kill Trotsky instantly, as Mercader had intended. Witnesses stated that Trotsky spat on Mercader and began struggling fiercely with him. Hearing the commotion, Trotsky's bodyguards burst into the room and nearly killed Mercader, but Trotsky stopped them, laboriously stating that the assassin should be made to answer questions. Trotsky was taken to a hospital, operated on, and survived for more than a day, dying at the age of 60 on 21 August 1940 as a result of severe brain damage. Mercader later testified at his trial:
I laid my raincoat on the table in such a way as to be able to remove the ice axe which was in the pocket. I decided not to miss the wonderful opportunity that presented itself. The moment Trotsky began reading the article, he gave me my chance; I took out the ice axe from the raincoat, gripped it in my hand and, with my eyes closed, dealt him a terrible blow on the head.
According to James P. Cannon, the secretary of the Socialist Workers Party (USA), Trotsky's last words were "I will not survive this attack. Stalin has finally accomplished the task he attempted unsuccessfully before."