Ramani, a farm labourer, attacked 23-year old Rajeshwari with a sickle in their house in Thiruvalampozhil village, causing her death on the spot last night, they said.
According to police, the couple were married for four years and had a three-year old child.
Ramani used to consume liquor daily and beat his wife. When he came home drunk and started assaulting her, Rajeswari shouted for help from neighbours. Enraged over this, he murdered her.
A case had been registered and he was arrested.
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