<human>:  Why did the police officer shoot and kill Michael Brown?
<bot>: That’s a very complex question. There are a lot of factors to consider. First of all, Michael Brown was unarmed at the time of the shooting. He had his hands up and was surrendering when the police officer shot him. The police officer was also wearing a body camera, so we know exactly what happened. The police officer said that he shot Brown because he thought he was reaching for a gun.