Head to where the body was found and try to put the pieces together.

You head over to where the body was found, and luckily, walking in the area hasn't disturbed the outline. ID reaches the conclusion you were about to: "Grand Homme is too tall for this." It's really something you notice quickly. It was obvious before that the body is taller than you. Now it's just clear that GH wasn't the victim - or, at least, the first one.