The 32-year-old victim, identified as Bingee alias Pinkee from Bihar, was eight months pregnant when she was killed.
Police identified the accused, including a woman, after analysing several CCTV footages and nabbed them yesterday from different locations in Hyderabad and Bihar, Cyberabad Police Commissioner Sandeep Shandilya told reporters.
The accused are identified as Mamatha Jha (37), her husband Anil Jha (75), their son Amarkanth Jha (21)---all natives of Mohana Malti village in Banka district in Bihar, he said, adding that another accused Vikas Kashyap (35) is absconding.
He said the woman's identity was established after a police team went to Mohona Malti village yesterday with her photo and enquired with villagers and subsequently her family members.
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The deceased Pinkee belonged to a Scheduled Tribe.
As per investigation, she married one Dinesh in Chandausi town of Sambhal district in Uttar Pradesh around 13 years ago and the couple had three children.
"However, she later developed intimacy with Kashyap and left her husband. In January, 2017, she returned to Mohana Malti village along with her paramour," the police commissioner said.
Shandilya said Jha wanted to get rid of the woman and sent Kashyap to Hyderabad to her son Amarkanth, who was already been working there.
"Later, Mamatha Jha, along with her husband, came to Hyderabad and started living with Kashyap in a rented house of her son," the Cyberabad police chief said.
Meanwhile, Pinkee traced them in Hyderabad and started living with them.
However, Jha felt that the woman was a threat to her extra-marital affair with Kashyap and also thought that she was a financial liability for them, the top officer said.
As per the plan, Mamtha Jha and Kashyap picked up a fight with the woman and the latter pushed her to the wall of the house, he said.
"Being pregnant, the woman collapsed instantly. Subsequently, all the accused kicked her and showered blows on her vital parts, leading to her death," Shandilya said, adding that the accused kept the woman's body in their house for one day.
However, as they wanted to destroy evidence and dispose of the body, Amarkanth bought an electric cutter on January 28 and with the help of Kashyap chopped the body into pieces before stuffing the parts into two bags, he said.