A 33-year-old woman poisoned her teenaged son and committed suicide at Thiruninravur on Friday. Police said she took the extreme steps following a misunderstanding with her husband.

Thiruninravur police identified the deceased as Latha and her son Devanathan (14). On Friday afternoon, Latha had an argument with her husband Srinivasan, a realtor on a family matter. A disappointed Latha left for her mother residence in Kosavapalayam, Thiruninravur along with her son.

She mixed pesticide in food and gave it to her son. She consumed it as well. Relatives rushed them to the Tiruvallur General Hospital from where they were referred to Kilpauk Medical College Hospital. They were declared dead there, police said.