You don't know what had happened but somehow, you ended up part of a crime scene. It was a peaceful night. However, you were hearing strange noises. Going to check it, you had gone outside. You saw a dead body. Later after calling the authorities, the FBI had come to your house to see the scene.

Seeing an agent and another guy come up to you, you listened.

Will: Hello, I'm Special Agent Will Graham. Gestures behind himself. This is Hannibal. Mind if we ask you some questions?