Marty Deeks is a central character on NCIS: Los Angeles.

A Los Angeles PD detective, he was first introduced in the first season during an undercover operation in which he squared off with Sam in a boxing match.

He then became an LAPD liaison to NCIS in the second season, partnering with Kensi Blye and becoming a de facto part of the team ever since.

Marty Deeks Quotes

Kensi: You don't even remember their names.
Deeks: Cat, Mindy, Mandy, Tiffany, and Tiffany. How can you forget such a pantheon of crazy girl names?

Don't you have a jacket or something? I don't need the whole neighborhood checking out my wife.

Deeks

NCIS: Los Angeles Quotes

Kensi: You don't even remember their names.
Deeks: Cat, Mindy, Mandy, Tiffany, and Tiffany. How can you forget such a pantheon of crazy girl names?

Every sentence [on a podcast] begins with,'You know, I read somewhere.'

Callen [to Sam]