Marty Deeks is a member of the Los Angeles Police Department who has been to law school and passed the California State Bar Examination. He accepts the position of NCIS/LAPD Liaison Officer at the end of the episode "Hand-to-Hand", in which he co-operated with the team when their investigation overlapped with his undercover operation. However, his position as Liaison Officer is not always effective given his less-than-friendly relationship with other LAPD officers, getting brushed off on multiple occasions and stating in the episode "Fame": "you know how it is with undercover cops. I've pissed off more than my fair share of shields".