Brass began with Delia Herrera, "Ms. Herrera, we've had an interesting development in this case and Ms. Willows here needs to ask you some additional questions."

Delia nodded at Brass and turned her attention to Catherine.

"Ms. Herrera, are you familiar with DNA fingerprinting?"

Delia shook her head, "No. What is it?"

Catherine shot Brass a look, "DNA is in every cell of your body. With the exception of identical twins, no two people on the planet have the same DNA. Half of your DNA comes from your mother, and half of it comes from your father, so we can also determine close relatives of individuals based on their DNA profiles. Does that make sense?"

"Yes," Delia nodded, "I had no idea."

Catherine sat down at the table across from Delia, "Ms. Herrera, I need to ask you some questions, and you may have answered some of them before, but I need you to answer them anyway."

Delia nodded and glanced up at Brass who was leaning against the wall.

Catherine continued, "Ms. Herrera, do you have any children?"

The color began to drain from Delia's face.

"We have reason to believe that you do." Catherine suggested.

Delia looked into Catherine's eyes, "Ms. Willows, you're a mother, no?"

Catherine gave her a half smile and nodded.

"No one in this country knows this, but I had a son. I gave him up for adoption." Delia's eyes were misting.

Brass interjected, "That son is Dr. Vargas, isn't he?"

Tears began streaming down her face as she nodded, "Yes, we found each other on the internet."

Brass continued, "One thing I don't understand, why did you pose as his housekeeper? Did Mrs. Vargas know?"

Catherine handed Delia a Kleenex, "It's ok."

Delia continued, "We didn't want him to find me." She started sobbing.

"Didn't want who to find you?" Catherine looked quizzically at Brass.

Delia couldn't answer through her sobs.

"The father?" Catherine queried.

Delia nodded.

"Who is the father, Ms. Herrera?" Catherine pushed.

Delia looked up at Catherine and over at Brass before she answered, "My brother, Victor Hernadez. He raped me. When he found out I was pregnant he forced me to give him up for adoption. He told me if I ever searched for Antonio or told anyone, he would come after me and kill me."

Catherine reached over and gripped Delia's hand, "It's ok, Ms. Herrera, we're going to find him."

Brass gestured to one of his officers and had them show Dr. Vargas in.

Dr. Vargas looked at Delia and she nodded, "Madre?"

"Antonio, it was Victor. He killed Isabel. I didn't know until they told me about this DNA." Delia explained as she dissolved into tears. Dr. Vargas took her into his arms and just held her as she cried.

"Dr. Vargas, Ms. Herrera, with your consent, we're going to put you into protective custody until we locate Mr. Hernandez." Brass stated.

They nodded and Brass had the officer who had brought Dr. Vargas into the room lead them out.

"Sick bastard," Catherine commented, "That poor woman, all these years living with that."

"That's why we do what we do, Catherine. Put the bad guys in jail." Brass replied with a slight smile."

"Let's go find his ass." Catherine quipped in response.

Behind the two way glass, Warrick, Nick, and Sara took in the interview with interest. Nothing really shocked them anymore. As premiere crime scene investigators, they had seem almost anything that Sin City could offer. And it had offered the worst that people could dish out.

Warrick moved toward the door, "I'll see you guys back at the lab."

"Right behind you, Bro." Nick called out.

"Bye, Warrick." Sara waved.

Nick turned to Sara, "Hey, Sar, wanna get breakfast after shift?"

She smiled, "Sure, but I think maybe we ought to invite the rest of the team, especially Greg, to celebrate breaking the case."

Nick grinned at her, "See, that's why I like you, Sara Sidle, you're smart and beautiful."

Sara grinned mischievously, "You're only saying that because it's true." She winked at him and headed out the door toward the parking lot.

He grinned and followed.