C9: Case 2: Closed
[1 hour later]
Lanie had called a few minutes earlier with the update. The Fertilife pills tested positive for aconitine, the same nasty compound as on the flower, but the concentration was much lower, barely enough to cause mild symptoms over days instead of killing in minutes. The flower carried the lethal dose. She also said that she found some fingerprints on the pills which belongs to Justin. Kate listened to the report without interrupting, then thanked Lanie and hung up. She turned to Travis.
"Justin switched the pills to shift suspicions away from him. Lanie found his fingerprints on the pills. He knew we would check the vitamins eventually. The flower was the real weapon, but the poisoned pills gave him a backup story if we started asking questions about how she got poisoned."
Travis nodded once. "Makes sense. He never imagined we'd look into a simple blue flower, and as intelligent as he thinks he is, he messed up with the pills again... This guy had a perfect plan, but in the end... an amateur."
Kate already had her phone out. She dialed Justin's number and kept her voice professional when he answered. She told him they had new information from the autopsy and needed him to come back in right away. He agreed without arguing, sounding tired and cooperative. Thirty minutes later, he walked through the precinct doors again, shoulders slumped, eyes still red from earlier.
The officers led him straight to Interrogation Room 1.
The elevator opened, and Castle walked in again. He went straight to Kate. "So, what did I miss?"
"I think we found our killer," Kate replied, walking toward the interrogation room.
"Wait! The husband did it?" Castle asked.
Kate quickly gave him the brief information on what happened. Then they went in together while Travis, Esposito, and Ryan took positions on the observation side.
Justin sat at the metal table with his hands folded in front of him. He looked up when the door opened and managed a weak attempt at a smile that never reached his eyes.
"What's going on?" he asked. "I already said everything I know."
Kate pulled out the chair across from him and sat down slowly. Castle stayed standing near the wall with his arms crossed, watching Justin the way he watched suspects when he thought they were hiding something big. Kate opened the thin file she carried and slid a single photo across the table. The enlarged image showed the blue flower from Laura's hair, petals vivid against the evidence bag background.
Justin stared at the picture. His face went blank for a second, then he looked up at Kate with confusion written all over it.
"I don't understand," he said. "What's the meaning of this?"
Castle smiled, the kind of smile that said he already knew the answer and was waiting for the other person to catch up.
"You tell us," he said.
Kate leaned forward just enough to keep eye contact steady. She kept her voice calm and even, the way she always did when the pieces were falling into place.
"This flower was in your wife's hair when she died. The petals were coated with aconitine, a poison that comes from a specific plant. She absorbed enough through her skin and maybe by brushing her face or smelling it to kill her in under a minute. Nosebleed, seizure, respiratory failure. All of it matches what you described in the park."
Justin swallowed hard. His hands tightened on the table edge. "She liked flowers. She put one in her hair sometimes when we went out. I don't know anything about poison."
Kate tapped the photo once with her fingertip. "This isn't a random flower you pick up at a street stand. This is a hybrid strain from a closed research project at Columbia University. High aconitine yield, lab cultivated for pharmaceutical work. The program shut down three months ago after an explosion in the greenhouse. Three people died. You worked there as a research technician. You had full access to the plants and the extraction equipment."
Justin's breathing changed. It came faster now, shallower. He looked from the photo to Kate, then to Castle, then back to the photo like he hoped it would disappear if he stared long enough.
"I worked there," he said. "Yeah. I watered plants, logged data, and cleaned beakers. I wasn't growing poison. I was trying to help develop pain meds. The explosion... it was an accident. Faulty equipment. I wasn't even in the greenhouse when it happened."
Kate opened the file again and placed another sheet in front of him. This one showed his personnel photo from the project roster, the same younger face they had seen on the archived page.
"You had keys to the locked cultivation rooms," she continued. "You signed out samples for testing. After the shutdown, inventory logs show several plants and extracted compounds unaccounted for. Someone with your access could have taken what they needed before everything got destroyed or moved."
Justin shook his head slowly at first, then faster. "No. I didn't take anything. I lost friends in that explosion. I quit right after. I couldn't go back."
Castle stepped forward one pace. "You quit because the project ended. Convenient timing. And now your wife dies from the exact same poison that was being studied in your old lab. That's not a coincidence."
Justin's voice cracked when he spoke next. "I didn't kill my wife. What about the pills?"
Kate kept her gaze locked on him. "You switched them out, didn't you?"
"Switched them out? What are you talking about?" Justin stuttered a bit.
"We found your fingerprints on the pills," Kate said as she leaned forward. "So, Justin. What happened? Why did you kill Laura?"
Justin stayed silent for a long stretch, staring at the photo of the blue flower like it might speak for him if he waited long enough. His fingers twitched once against the edge of the table, then went still again. The room was filled with the low hum of the ventilation system and nothing else.
Castle pushed off the wall and walked around to the side of the table where Justin could see him without turning his head. He pulled out the empty chair next to Kate and sat down slowly, resting his elbows on the metal surface. His voice came out calm, almost conversational, the way he talked when he was piecing together a plot that had finally clicked into place.
"You loved her once," Castle said. "I believe that part. But somewhere along the line, the love turned into something heavier. Resentment. Maybe even hate. Laura came from money, old family money that never quite ran dry even after the market dips. She had trust funds, investments, and property deeds in her name from before you two even met. You married into it, and for a while, that felt like winning the lottery. Then the years passed, the bills kept coming, and you started realizing the money was hers, always hers, locked behind layers of legal paper you could never touch without her signature."
Justin kept his eyes on the table. A muscle jumped in his jaw.
Castle continued without pausing. "You worked long hours at that Columbia lab, breathing greenhouse fumes, watching plants grow while your paycheck barely covered the rent on the nice apartment she picked out. You told yourself it was temporary, didn't you?"
Justin looked up at him. "You know nothing."
Castle continued, "You told yourself you were building a future together. But deep down, you started counting every dollar she spent on herself while you scraped by on what you earned. The resentment built quietly at first, like mold in the walls. Then the project shut down after the explosion, your colleagues died, and suddenly you had no job, no prospects, and a wife who still had everything. Then you found a job with minimal pay. But that feeling of inferiority didn't go away, did it? You started thinking about the insurance policies she carried, the ones she renewed every year without telling you the details. Three million in life insurance. Ten million in assets that would transfer to you the moment she stopped breathing. Enough to walk away clean, start over somewhere new, maybe even with someone new."
Justin's chair scraped against the floor as he leaned back hard enough to rattle the metal legs. His hands came up to his head, fingers digging into his hair like he wanted to tear something out.
"You have no idea how it feels," he said, voice shaking. "You have no idea what it's like to live under your wife's shadow every single day."
Kate did not move. Castle stayed quiet, watching him.
Justin laughed, but it came out jagged and wrong. "Everyone thought I was the lucky guy. Married the rich girl... the guy who stole the golden apple. You know what that feels like?"
He looked up, eyes wet but burning.
"A guy who's leaching off his wife... A fucking accessory... A trophy husband."
He slammed his palm flat against the table and the sound echoed off the concrete walls.
"She never meant to make me feel small. That's the worst part. She was kind about it. Always kind. She would say things like, 'It's our money,' or 'We're a team.' But when the mortgage got paid, it was her trust fund. When the car needed repairs, it was her investment dividends. When we went on vacation, it was her family account."
His voice dropped lower, rough with something older than grief.
"I worked my ass off in that lab. I stayed late, logged every sample, and cleaned every piece of equipment. I thought if I proved myself there, if the research took off, I could finally stand next to her instead of behind her."
He swallowed and shook his head slowly.
"Then the explosion happened. I watched three people I knew get zipped into bags. I lost my job the same week. And Laura came home with flowers and takeout and said we would be fine because she had enough saved for both of us."
His mouth twisted.
"She thought she was comforting me. She was just reminding me that I brought nothing to the table."
Kate leaned forward slightly. "So you decided to fix that by killing her?"
Justin's breathing hitched. He looked like he might deny it again, like he was still trying to hold on to the version of himself that sat in the break room holding cold coffee.
Then something inside him cracked.
"I did not plan it at first," he said quietly. "I just took one plant from the lab before they shut everything down. I told myself it was a souvenir. Something to remember the project by. I kept it in the storage locker for months."
Castle spoke gently. "And then the idea showed up."
Justin nodded once, slow and stiff.
"I started reading the insurance documents. I told myself it was practical. If something happened to her, I needed to know what to do. That's what I told myself. But the numbers started sticking in my head. Three million from the policy. Ten million in assets. Investments that would liquidate clean the moment I filed the paperwork."
He looked at Kate again.
"I wanted kids. We talked about it every day. But after I lost the job, all I could think about was being trapped. A child would lock me into that life forever. I would always be the guy who could not provide for his own family."
His voice dropped to a whisper.
"I could not stand the thought of raising a child who would look at me the way everyone else did. Like I was lucky to be there."
Kate's expression hardened. "So you poisoned her."
Justin's jaw tightened.
"I extracted the aconitine at home and took the antidote. It was not hard. I had done it a hundred times in the lab. I coated the petals of that flower the morning of the walk. She always tucked one into her hair when she felt romantic. I knew she would do it again. I made sure the dose was high enough to work fast."
He rubbed his hands together like he was trying to wash something off that would never leave.
"I brushed her hair before we left. I made a joke about how the blue matched her eyes. She laughed. I kissed her forehead."
Castle's voice lost its warmth. "And the vitamins."
Justin let out a hollow breath.
"I needed a backup. Something that would confuse the timeline if anyone started digging. I switched the bottle after she went to the bedroom. The poison wasn't enough to kill her quickly. Just enough to show up on a tox screen and point somewhere else."
He looked down at his hands.
"I did not expect you to test the flower. I thought it would be dismissed as decoration."
Castle leaned back in his chair. "You underestimated the team."
Justin's shoulders sagged like the fight had drained out of him.
"When she started bleeding in the park, I almost panicked," he admitted. "It happened faster than I imagined. She looked at me like she was afraid. She said she loved me."
His voice broke again, but this time there were no tears.
"I held her while she died. I told myself it was mercy. That it would be quick. That afterward I could finally breathe without feeling like I was disappearing."
Kate stood slowly.
"You did not want a wife," she said. "You wanted her money and her silence."
Justin shook his head weakly.
"I wanted to matter."
"You chose murder to feel important," Kate replied as she stood up and took out her cuffs. "That is not insecurity. That is selfishness." She walked over and cuffed him. "Justin Washington, you are under arrest for the murder of Laura Washington."
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