Chap 2
Chapter 2: The Broken Toothbrush
Victim: Nguyễn Thị L. – Abusive Stepmother
Crime: Alkaloid poisoning via toothbrush
Modus Operandi: Absorbed poison through bristles during repeated use
Forensics: Alkaloid residue found in oral tissue and gums
I didn’t kill her because I hated her.
I killed her because she never once realized I was watching her.
Nguyễn Thị L. became my stepmother when I was eight years old. My biological mother had vanished into a closed casket and a coffin sealed too quickly for questions. My father remarried in less than six months. And that’s when she moved in — with her fake smile, her cheap perfume, and the backhand of a butcher.
She slapped with the intent to leave silence in your mouth for hours.
At first, I counted the bruises like stars. Then I stopped counting altogether. She was smart, too — never in public, never hard enough to hospitalize, just enough to twist my bones around her presence. My father never saw. Or he did, and chose not to.
I left home at sixteen. Never looked back.
But she wasn’t done hurting people. Two years later, I learned what she had done to my half-sister — eleven years old, quiet, always flinching at loud noises. I saw the bruises one day when I picked her up from school. I saw her arms. And I saw the fear in her mouth when I asked.
That night, I decided Nguyễn Thị L. would die.
Not suddenly. Not quickly. Not with drama.
I wanted her to fade — slowly, silently — like the poison she’d been to us.
Observation Phase – Week 1
She had a rigid morning routine. Wake at 6:00 AM. Boil water. Brush her teeth before tea.
Colgate toothbrush — soft bristles, color pink. She didn’t change them often. Maybe once every two months. She kept her brush in a blue plastic cup, top shelf, always dry. She never noticed when I replaced it.
That was her mistake.
The Poison
I didn’t choose cyanide. Too quick. Too suspicious.
I used aconitine.
Extracted from aconitum napellus — monkshood. One of the deadliest natural alkaloids. The thing about aconitine is, it doesn’t need to be swallowed. It can be absorbed directly through mucous membranes. The tongue. The gums. Even tiny wounds from brushing too hard.
Symptoms? Numbness. Tingling. Then nausea. Paralysis. Cardiac arrest. And if administered gradually? It mimics autoimmune disease or rare heart failure.
I brewed the extract myself, from dried roots ordered online for “botanical research.” Boiled, strained, filtered. Then I soaked a new toothbrush in the solution, dried it under UV light. No smell. No visible change.
She would brush her teeth every day, rubbing death into her own mouth.
Execution – Week 2
On a Thursday evening, I entered her house.
She wasn’t home. Still at the community church she volunteered at — an irony so loud I nearly laughed.
I had the spare key. She didn’t know I still had it.
I went to the bathroom. Switched the brushes. Her old one, I sealed in a bag and carried out.
Then I left.
Day one — no change.
Day two — she began to feel dizzy.
Day four — she visited a doctor. Blood pressure was normal. Slight inflammation of the gums.
Day six — she collapsed while doing laundry.
Still alive. But she was slipping.
On day ten, she was admitted to the hospital for persistent vomiting, numbness, and irregular heartbeat. The doctors suspected arrhythmia due to age. They were wrong.
On day twelve, she died in her sleep.
Forensic Report (Confidential Excerpt)
Case ID: 2022-1174-L
Subject: Nguyễn Thị L., Female, Age 53
COD: Cardiac arrest, suspected due to chronic undiagnosed condition
Toxicology:
Elevated presence of aconitine alkaloid compound in gingival tissue and oral mucosa
Trace concentration in blood serum (below lethal threshold individually)
No gastrointestinal ulcerations
External Signs:
Mild bleeding at gumline
No injection wounds, trauma, or dermal exposure
Conclusion: Probable gradual poisoning via oral exposure, possibly environmental or through repeated use of contaminated hygiene item
Status: No suspects. Case closed.
The day after her funeral, my half-sister hugged me.
She didn’t cry.
I didn’t tell her why.
That night, I sat by the window, rain tapping like a metronome. I pulled out the black notebook and wrote the second name.
2. Nguyễn Thị L. – Age 53 – DOD: May 19th, 2023
And next to her name, I drew not a checkmark — but a small flower.
Because sometimes, silence is not vengeance.
It’s mercy.
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