Erica Jane Barrett, better known as E.J. Barrett, is a NCIS Special Agent and also the former girlfriend of NCIS Special Agent, Anthony DiNozzo Junior.
Born to an unknown mother and father, and the niece of former SECNAV Phillip Davenport, 'E.J.' grew up in an unknown area where she spent some time as a cheerleader during high school.
After graduating from high school and presumably from college, EJ joined NCIS with her advancement within the agency beginning when she accepted a position as Special Agent in Charge of Rota, Spain after NCIS Special Agent Anthony DiNozzo who Shepard had originally offered the position to declined the promotion, DiNozzo instead preferring to remain a part of the NCIS Major Case Response Team headed by Leroy Jethro Gibbs while also retaining his position of second-in-command and Senior Field Agent of the team.
As such, EJ took the position and departed for Rota, Spain, staying for an undisclosed amount of time and presumably during that time, she met her future colleagues, NCIS Special Agents Gayne Levin and Simon Cade with the three also forming the structure of EJ's own team.