NCIS Season 8 Episode 12 : Recruited
A petty officer's recruitment session at a college fair comes to a fatal end, prompting the NCIS team to solve his murder. The team learns of the petty officer's homosexuality, leading Gibbs to classify the murder as a possible hate crime. Ducky's predecessor at NCIS, Dr. Walter Magnus(Bob Newhart), pays a visit. The team tracks down several suspects, but Gibbs eventually figures out that the killer was the father of one of the students the petty officer was advising. The father did not realize the petty officer was trying to help his son deal with his homosexuality, and feared he was attempting to start a relationship with him.