Koodathayi cyanide killings
The Koodathayi cyanide killings were a series of unnatural deaths that were later regarded as murders, that occurred in Koodathayi in Kerala, India. The crimes were investigated in late 2019, involving the mystery of 6 deaths over a span of 14 years.
Source: Wikipedia — Koodathayi cyanide killings (CC BY-SA 4.0)