The prime suspect in the case is a youth who used to harass the wife of the deceased, identified as Surendra Yadav, and had been warned by him several times, said a police official.
The group barged into the residence of the victim around 1.30 AM and attacked Yadav's wife with knives. When Yadav came to her rescue, the accused men stabbed him multiple times and then smothered him with a pillow to confirm that he was dead, he said.
A neighbour called up the police and the couple were rushed to a hospital, where Yadav was declared brought dead, police said.
A case under Section 302 (murder) of IPC was registered against several unknown persons and investigation was taken up, said the official.
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Police detained several persons, including the prime suspect, till evening and grilled them for hours. However, they have not arrested anyone yet.
According to the woman's complaint, the couple - with their three children - had shifted to their present apartment around six months ago. They vacated the previous apartment, located nearby, as the landlord's son used to harass her. Her husband had also confronted him several times, during which he had threatened Yadav, police said.