Noida, April 5 -- After witnessing a night of relentless arguments between Asma Khan and her husband Noor-ul-lah Haider, their children were resting in their room on Friday afternoon when tragedy struck. According to police, Haider locked his wife in the bedroom, muffled her screams with a pillow, and bludgeoned her to death with a hammer.

"Dad shouldn't have done that," said 19-year-old Samad, Asma's son and a BTech student at Amity University, as he packed his bag to leave their two-storey home in Noida's upscale Sector 15.

The children said their parents, married in 2005, had been arguing daily in recent weeks as Haider increasingly accused Asma of having an affair.

"We were in our room on Friday when my sister Inaya went to check o...