Latha alias Umamaheswari (24) and her son Naveen (6) were killed in their house in Sathyanagar near Arcot on Thursday.
According to police, Latha's husband Rajesh (30), who was working as a carpenter in Dubai, had come home about 10 days ago on a holiday. Suspecting the fidelity of his wife, Rajesh often quarrelled with Latha. On Thursday morning, he picked a quarrel with her. In a fit of rage, he slit the throat of Latha and Naveen with a kitchen knife, killing them on the spot. Rajesh, who complained of indisposition, had been admitted to the Government Vellore Medical College Hospital, Adukkamparai, police said.