Heartland

A pair of Marines are ambushed outside a nightclub, leaving one dead and the other in critical condition. The NCIS team's investigation leads them to Stillwater, PA, the hometown of one of the Marines, and of Leroy Jethro Gibbs. The search leads them to a mining director and his family; his daughter is the ex-girlfriend of the wounded Marine. When the team finds out that the wounded Marine is actually the son of the director, investigation turns to his son-in-law who is discovered to have ordered the attack on the Marines. While in his hometown, the team is introduced to Gibbs' father (Ralph Waite), explores his past and the origins of his relationship with Shannon (his first wife).