Six deaths in one family over 14 years. Police say they have found their killer: The daughter-in-law.

NEW DELHI — Koodathayi is an unremarkable landlocked village in the state of coastal Kerala in southern India. But in October, police there claimed to have made an “unbelievable” discovery: A woman had killed six relatives over 14 years with cyanide.

Jolly Joseph, a 47-year-old mother of two sons, was arrested in October for the murders of her first husband and five others between 2002 and 2016. Police say she has confessed to the killings.