NCIS Episodes :- Deliverance

Gibbs’ ‘Marine ID card’ is discovered at the homicidal site where a dead body of a naval soldier is found. But with the advancement of the investigation, it’s come to know that it’s linked to the 18 years old incident when Gibbs provided his cordial assistance to a Columbian lady after killing her husband and so that her son was trying hard to meet him to inform him about the probable ‘blackmailing’ which was linked with the case of the stolen assault rifles from a naval base.