1932 - Alpha, The Talking and Shooting Robotvia cyberneticzoo.com
Alpha is the name of the robot that was designed to be a personal assistant in 1932. It was originally an exhibition at the Dome in Brighton.
The robot, Alpha, was programmed to answer a sequence of voice commands, including firing a gun. Apparently his creator did not think there was anything wrong with teaching a prototype robot how to shoot a gun, and also to demonstrate this feature to a live audience.
He is rethinking that decision since Alpha would eventually manage to shoot his creator, though not fatally. Either way, using robots as assistants is still an issue under development.