A man was killed by his family members after he raped his sister, sister-in-law and niece. The family members including his parents were arrested in the northern Indian state of Madhya Pradesh on Monday.

Police said the body of the 24-year-old man was found at a hillock on Nov. 12. An autopsy was conducted following which the body was handed over to the family. There was, however, no evidence that could lead the police to the murders. During investigation, police found the man’s slippers at some distance away from where his body was discovered. This raised a suspicion that the man’s body was dumped in the hillocks after being murdered somewhere else. A tip led the police to detain the man’s parents.

“The couple’s grief on seeing the body of their son seemed artificial but we couldn’t believe that a man or woman would kill his/her son for any reason. We worked on various angles but couldn’t get any success. It was after a tip off by informers that we interrogated the couple. But they continued to mislead us. It was only after we applied psychological methods tactfully that the couple confessed that they murdered their son with the help of their younger son,” police said.

During interrogation, the couple told police that their son was an alcoholic and raped his sister, younger brother’s wife and niece several times in a drunken state.

“The accused told us that the deceased was an alcoholic. He had raped his sister, younger brother’s wife and niece. Even he had molested his mother too. His wife had deserted him six to seven months back. On the night of Nov. 11, he attempted to rape his sister-in-law again. This is why they killed him,” police said.

The parents, their younger son and his wife were arrested for the murder of the man and remanded in judicial custody.

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Representational image of police officials investigating a crime scene in Bangalore, Karnataka, in southern India, Sept. 5, 2017. MANJUNATH KIRAN/AFP/Getty Images