When Parker finds a severed finger in a bird's nest while playing with Booth, the team gets together to find the rest of the body. After the body is found in Jefferson Memorial Park, it is revealed that the death was a murder. With the help of a new grad student, the team is able to identify the body as a local veterinarian with a gambling problem. This fact leads them to an illegal dog fighting ring where, with the help of Cesar Millan, the team is able to gather enough evidence to track down the killer.