The 29-year-old trader, identified as Mehtab Alam, discovered that his sister, 24-year-old Nilofer Bibi, a mother of two was staying with a rickshaw-puller with whom she had eloped, police sources said today.
Alam went to the rickshaw-puller's house, dragged out his sister and beheaded her with the sword in full public view yesterday, Deputy Commissioner of Police (Port division) Mehboob Rehman told PTI.
Local people watched horrified as Alam walked down the road at Ayubnagar with the severed head dangling in his hand, before surrendering to the Nadial police station.
"He even asked for a glass of water after reaching the police station," police sources said.
According to eye witnesses Alam justified his crime saying he did it punish his sister for the extra-marital affair.
"It was not the decision of the family to kill her. The brother had lost his temper over his sister and had unilaterally decided to kill her," the DC (Port) said.
Alam was today remanded to judicial custody till December 22 after his production in Alipore court.