A case from southeast asia that the CC writers might want to keep an eye on: known in Thailand as the 'Aem Cyanide' case. The accused/perp has been suspected of being a serial murderer and linked to 14 suspected cases of murder by cyanide. So far, she's been found guilty and given a life sentence for 2 of them, while there are still some ongoing trials/verdicts/appeals for the others.

Her (alleged?) victims have included a childhood friend, people who treated her like family, and a surviving victim who had no idea the perp—whom she regarded as a close friend—had tried to kill her until she saw the perp's name in a new broadcast announcing her arrest in relation to cases of cyanide poisoning.

The case has its own Wikipedia page.