I'm going to say this takes place in season 10 because if I give you the exact season with the bad guy... I'm afraid you will catch on more quickly than I would like. So, the perp could be from any season before season 10. Good luck! :)

Do you ever over analyze things? You could be sitting in a room with a two people and when you turn your head, you don't even remember their hair color. As a detective, I'm trained to do so. I try to memorize everything about a person just in case. I should have been paying attention to everyone who walked through those doors. There was the little kid who was lost and couldn't find his mother. There was Langan walking with Cabot. There was the tall guy who had a long beard then, I left with Elliot to talk to a victim.

"Hey El," Olivia said saving her document and exiting out of it, "When we left, Munch and Fin were upstairs looking at photos from the case, right?"

Elliot looked up from his computer and squinted his eyes, "Yeah. They were here all after noon."

Olivia nodded, "Maybe they saw some people coming in. I only remember up until we left."

"Fin just texted me and said they are on their way back," he said closing his phone, "We'll have to talk about it."

Olivia sighed and ran her hands through her hair. She was more than tired but she knew that trying to go to sleep wasn't going to solve anything. She wiped the tiredness out of her eyes and stood to stretch.

"You sure you're holding up okay?"

Olivia nodded, "I'm fine, El."

Fin and Munch came waltzing into the squad room with long looks on their faces. They were just as disturbed about what had happened as anyone.

"We need to go over every person that walked through those doors," Olivia said sitting back down in her office like chair and spinning it to face Munch and Fin.

"When you guys left it was quiet," Fin shrugged, "The only other people that came in were Alex and Trevor."

"We can't rule anybody out," Elliot said placing his hands on the back of his head in the resting position.

"What are you saying?" Olivia asked hastily, "I sure hope you're talking about Langan as a suspect because Alex would never do this."

"I didn't see either of them leave," Munch said adding his two cents.

"Me either," Fin chimed.

Elliot shrugged, "Let's check out Langan first."

"Hey," Alex said with grief stricken on her face, "I heard what happen. I can't believe it." The tall blonde sat at her desk with her hands resting gently on top of it when the gang of detectives entered.

"Do you know where Trevor Langan is?" Olivia asked, "We kind of need to find him."

Alex raised an eyebrow, "No. Last time I talked to him was early this morning in chambers. We were talking with Judge Houston about a trial."

Olivia nodded, "If you see him will you tell him to give us a call?"

"Sure," Alex agreed, "Again, I'm sorry about what happened."

The day was dragging on and Olivia was getting more and more depressed. She couldn't help but gaze over toward the door that was hiding the vicious crime. Every time she thought about what could have went down she cringed. She recalled the last time she had talked to Cragen. It was when he was telling her about the missing files. She didn't think anything of it at the time but, he had been genuinely scared. She didn't want to call him out about it because what detective in their right mind would do that to their captain? Not her. Now she sort of regretted it.

"Brought you some coffee," Elliot said sitting the steaming styrofoam cup down in front of her.

She jolted out of her thoughts and looked up at him, "Thanks."

"You want to talk about it yet?"

"Elliot, I told you I was fine."

"No you're not," Elliot insisted, "You and Cragen were close. Closer than any of us here."

Olivia sighed. She could feel her throat starting to burn and her eyes began to water. "At night when everybody else would go home to their lives... we would talk. I would be the only one here and he knew I didn't like going home. We would just talk. About our lives. He told me about his wife... We bonded. He was the closest person I had to a parent figure. He cared about me and I-I cared about him."

Elliot felt terrible seeing Olivia break down like she was. He knew it was bound to happen sooner or later and he just wished he could bring Cragen back.

"It'll be alright," Elliot said rubbing his hand down her back.

"Sure," Olivia chuckled, "You still have a family."

"Liv..."

Olivia shook her head, "I'm sorry. I don't mean to be an ass."

"Why don't we go get something to eat? We can talk about it over lunch."

"Okay," she said giving him a half-smile.

"Okay."

"Liv's really upset," Fin said to Munch as they sat at their desks waiting for any information on the whereabouts of Langan.

Munch sighed, "She may not have been here longer than Elliot and I but, her and Cragen were close."

Fin nodded. He knew what it was like to lose somebody close to you. A few years back he had a best friend. They understood each other because they both grew up the same way. Fin used to think that having a best friend was a load of bull but when Lamar passed away, he knew he had lost a best friend.

The phone on Olivia's desk started ringing and since Munch was closer he walked over and picked it up.

"Special Victim's Unit, Detective Munch speaking."

"I need to speak with Detective Benson."

"She isn't here at the moment," Munch said, "Are you in any danger?"

The person on the other end hung up the phone and the dial tone sounded in Munch's ear. "Whoever it was hung up the phone."

"Did they ask for Liv?"

"Yeah," Munch answered, "Do you think we should trace the call?"

Fin shrugged, "Everyone's a suspect."

"I can't believe he's really gone," Olivia said sitting down in the booth and taking a bite of her pepperoni pizza, "I thought if anyone would get hurt it would be me or you. We are always getting into bad situations... I never thought about him getting hurt."

"It's okay to be upset," Elliot assured her, "Nobody's going to think any less of you."

"That's besides the point," Olivia said quietly, "Who cares if I cry? What's the point in it? What does it do for me? Nothing. It doesn't get justice. It doesn't solve the murder. Nobody cares. Leave it at that."

Elliot took a moment to look at Olivia as she sat there eating her pizza. She talk small bites and Elliot wasn't sure if she was hungry or if she just agreed to come because she wanted to get away from the precinct.

"I care."

Olivia sat her slice of pizza down and met Elliot's gaze. She wasn't sure if she had heard him correctly. She thought her ears were playing tricks on her. "What?"

"I care," he repeated, "I care when you cry. I hate seeing you cry because then I know that you aren't okay. I hate that you go alone every night by yourself after seeing what you do all day. I wish I could be there to hug you and tell you that everything will be okay."

"Elliot..."

"I mean it."

I'm not the only one who over analyzes right? The man who killed Cragen could be sitting in this room. It could be that man sitting at the far right by his self wearing the orange and gray jacket with a little piece of lettuce in his teeth. It could be the woman who was sitting behind me wearing the purple shirt and drinking the mixture of two sodas. It could be anyone.