CSI: Crime Scene Investigation: Season 4, Episode 5

4 - 5:

After a woman is killed in a head-on collision with a big rig, Catherine and Grissom discover the dead body of a man dressed in a full-size raccoon costume across the road. They uncover that the man is dressed like that because he recently attended a plushies and furries convention leading them to probe further into this subculture to see who may be responsible for the man