Theresa Diaz
Encyclopedia
Theresa Diaz is a fictional character
Fictional character
A character is the representation of a person in a narrative work of art . Derived from the ancient Greek word kharaktêr , the earliest use in English, in this sense, dates from the Restoration, although it became widely used after its appearance in Tom Jones in 1749. From this, the sense of...

 on Fox
Fox Broadcasting Company
Fox Broadcasting Company, commonly referred to as Fox Network or simply Fox , is an American commercial broadcasting television network owned by Fox Entertainment Group, part of Rupert Murdoch's News Corporation. Launched on October 9, 1986, Fox was the highest-rated broadcast network in the...

 series The O.C.
The O.C.
The O.C. is an American teen drama television series that originally aired on the Fox television network in the United States from August 5, 2003, to February 21, 2007, running a total of four seasons...

, played by Navi Rawat
Navi Rawat
Navi Rawat is an American television actress, known for her roles as Theresa Diaz on the drama series The O.C. and math prodigy Amita Ramanujan on the drama series Numb3rs. She is the niece of Prem Rawat....

. She is the child of Eva Diaz and the sister of Arturo Diaz, who is the best friend of Trey Atwood
Trey Atwood
Trey Atwood is a fictional character on the FOX television series The O.C., first portrayed by Bradley Stryker during season one and then by Logan Marshall-Green from season two onward...

.

Season 1

Theresa is a childhood friend of Ryan Atwood
Ryan Atwood
Ryan Francis Atwood is a fictional character on the FOX television series The O.C., portrayed by Benjamin McKenzie. A troubled teenager from Chino, California, he is considered the protagonist of the show, beginning as an outcast and is brought to a lifestyle of luxury by the Cohen family and is...

, and the two have engaged in an "off and on" relationship, which came to a halt upon Ryan's departure from Chino
Chino, California
Chino is a city in San Bernardino County, California, United States. It is located in the western end of the Riverside-San Bernardino Area and it is easily accessible via the Chino Valley and Pomona freeways....

. Over the Thanksgiving holiday, Ryan briefly returned to Chino to pay off Trey's debts, at the request of a still incarcerated Trey. Ryan went to Theresa's house to pick up a car from her brother that would later be used to pay these debts. During this time, Theresa and Ryan each exchanged apologies about the lack of communication during Ryan's absence, most notably Ryan's failure to inform Theresa of his exodus from Chino.

Soon after Theresa and Ryan met again, when Theresa began working in Newport for (as yet) unexplained reasons. Eventually, Theresa revealed that she and Eddie (a friend of Trey's from Chino) had become engaged. Soon after the engagement, Theresa developed cold feet (most likely due to the domestic violence
Domestic violence
Domestic violence, also known as domestic abuse, spousal abuse, battering, family violence, and intimate partner violence , is broadly defined as a pattern of abusive behaviors by one or both partners in an intimate relationship such as marriage, dating, family, or cohabitation...

 she suffered at Eddie's hands). A short time before this, Marissa Cooper
Marissa Cooper
Marissa Cooper is a fictional character on the FOX television series The O.C., portrayed by Mischa Barton. Marissa was among the original "core four" characters on The O.C. until her death in the season three finale, "The Graduates."...

 and Ryan had broken up over recent complications involving Oliver Trask
Oliver Trask
Oliver Trask is a fictional character on the FOX television series The O.C., portrayed by Taylor Handley. Oliver appeared in the series' first season as thorn in Ryan Atwood and Marissa Cooper's relationship, soon developing a severe obsession with the latter...

. Naturally, Theresa and Ryan began a relationship soon after. Eddie persisted in his attempts to win Theresa back, even showing up at Harbor High School to confront Ryan about his suspected relationship with Theresa. This finally culminated in Eddie making an appearance at the congratulatory party for Caleb Nichol
Caleb Nichol
Caleb Nichol is a fictional character on the FOX television series The O.C., portrayed by Alan Dale during the show's first and second seasons...

's being named Man of the Year. Eddie and Ryan came to blows, with Eddie being dragged away from the party and Ryan drenched in the pool. Theresa realized that she needed to resolve these issues, and left Newport to return to Chino and Eddie.

However, Eddie continued his abusive behaviors, and Theresa finally left him. She returned to Newport, seeking Sandy Cohen
Sandy Cohen
Sanford "Sandy" Cohen is a fictional character on the FOX series The O.C., portrayed by Peter Gallagher.Sandy, a lawyer, raconteur, and son of Sophie Cohen, is married to Kirsten Cohen. Their eldest child, Seth, is something of a social misfit. Sandy's father left his mother when he was young and...

's legal advice. While Seth Cohen
Seth Cohen
Seth Ezekiel Cohen is a fictional character on the FOX television series The O.C., portrayed by Adam Brody. Seth was one of the "core four" characters on The O.C. alongside Ryan Atwood, Marissa Cooper, and Summer Roberts.-Background:...

, Ryan, Sandy, Jimmy Cooper
Jimmy Cooper (The O.C.)
James "Jimmy" Cooper is a fictional character on the FOX television series The O.C., portrayed by Tate Donovan. He is often described as extremely unreliable, immature and cowardly, due to his actions....

 and Caleb are in Las Vegas for a "bachelor's party", Marissa discovered that Theresa is pregnant, with the father as yet to be named. For a time, Theresa reluctantly considered an abortion
Abortion
Abortion is defined as the termination of pregnancy by the removal or expulsion from the uterus of a fetus or embryo prior to viability. An abortion can occur spontaneously, in which case it is usually called a miscarriage, or it can be purposely induced...

, but Kirsten Cohen
Kirsten Cohen
Kirsten Cohen is a fictional character on the FOX television series The O.C., portrayed by Kelly Rowan. Kirsten is the wife of Sandy Cohen, mother to Seth Cohen, and the adoptive mother of Ryan Atwood...

 informed her that she still had a choice in the matter. Theresa decided to have the baby, and went back to Chino. Ryan, in an attempt to ensure that the baby has a better childhood than he had, left his newfound life in Newport to help Theresa raise her (and possibly his) baby.

Season 2

Theresa sensed Ryan's reluctance and doubt, so she deceived Ryan into believing that she had a miscarriage
Miscarriage
Miscarriage or spontaneous abortion is the spontaneous end of a pregnancy at a stage where the embryo or fetus is incapable of surviving independently, generally defined in humans at prior to 20 weeks of gestation...

, allowing Ryan to return to Newport, and the Cohen's. Theresa does not appear again until the end of season two, in The O.Sea
The O.Sea
"The O.Sea" is the 50th episode of the FOX television series, The O.C.. The episode was written by J. J. Philbin and was directed by Michael Lange. It originally aired on May 12, 2005.-Guest starring:-Plot:...

, where she convinces Ryan to trust Marissa's explanation about what happened between her and Trey. We learn at the end of this encounter that she has the baby, is living with her mother, who informs us that the baby "looks more and more like his daddy every day".

Season 3

Theresa drops off the map again until the end of season three, in which Kirsten spots her with her baby at the airport. She informs Sandy of this turn of events, who tells her not to tell Ryan, as he will no doubt interrupt his college visit at Berkeley
University of California, Berkeley
The University of California, Berkeley , is a teaching and research university established in 1868 and located in Berkeley, California, USA...

. She does tell Ryan, however, who lives up to Sandy's expectations, and returns home. Theresa comes to visit him, and informs him that the baby is in fact not his, but Eddie's. (However, it's strongly suggested that the baby is in fact Ryan's since it is seen with all light features like Ryan). The two spark another of their "relationships" for a short time, but Ryan's fight with Kevin Volchok
Kevin Volchok
Kevin Volchok, more commonly referred to as simply Volchok, is a fictional character on the FOX television series The O.C., portrayed by Cam Gigandet.-Background:...

convinces her that Ryan has not yet matured enough for a relationship with her, and fears the influence Ryan might have on her baby.
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