Artificial intelligence has infiltrated our lives, simplifying daily tasks such as unlocking our phones, predicting Google searches and driving our cars. But what if A.I. could kill us? What if it were embedded in fully autonomous weapons, leaving us humans out of the decision-making loop? Killer robots pose ethical concerns, as well as political and military dangers. Sascha Pare argues that they should be banned before we discover the unanticipated and tragic consequences of this technology.