ALWAR: Police on Thursday arrested a woman and her husband for allegedly killing her nephew two years ago by sacrifice to have a male child on Thursday. A third person has also been arrested in connection with the incident while a fourth managed to escape.According to the police, the victim's paternal aunt Girija Devi , a 45-year-old woman, had no son and wanted a male child. Devi told the police that she saw a tantrik `in her dreams frequently' who suggested sacrificing a boy for begetting a son.Devi spoke about the tantrik and her dreams to her husband, Govind Das , and two of his friends, Satendra Kumar and Anirudh. The four then planned to sacrifice nine-year-old Mukesh, De vi's brother's son. While the police arrested three of them, Anirudh managed to flee.The incident happened two years ago. Mukesh's father belongs to Madhya Pradesh and they had shifted to Shahjahanpur in Alwar district for work. Mukesh's body was found in a pond two years ago, Shahjahanpur's station house officer Rajesh Kumar said.The police investigated the case and but were clueless about the mysterious murder of the boy for two years. They said that Devi had lured Mukesh by promising him to buy slippers and biscuits.Along with her husband Along with her husband and his friend, she took Mukesh to a pond in Raiser village. They sacrificed the boy near the pond and dumped his body in it.