Alpha the robot, an invention of inventor Harry May, c. 1931. In September of 1932, the automaton was reported to have aimed and fired a revolver at its creator, who afterwards gave the ominous statement “I always had a feeling that Alpha would turn on me some day.” 

Or else May burned his hand on a premature discharge while loading the gun attached to the robot. Regardless, the robot was given a sex change by 1935, as seen in the final picture, presumably as the robotic equivalent of witness protection. 

[Cybernetic Zoo, Paleofuture]