Liz Warner is a fictional character in the CBS crime drama Numb3rs, played by Aya Sumika.

Liz is a special agent at the FBI Organized Crime Division and the former love interest of Don Eppes.

They met when Don was her tactical training instructor at the FBI Academy in Quantico, Virginia.

Liz is a tough woman who wants to achieve or exceed the men's standards.

[1] Since series regular Diane Farr was pregnant and expected to be on maternity leave, the producers and writers wanted to maintain a feminine perspective on the FBI team.