The accused have been identified as Lakhan Kirar (38), his mother, his brother-in-law Bhagchand, and an occultist Motiram Jatav, Additional Superintendent of Police (Addl. SP) Raghuwansh Singh said.
The victim, Mala Kirar (30), married Lakhan Kirar in 2004. After marriage, all the three children she bore were girls. However, Lakhan wanted a boy child, over which he decided to marry again and, along with the three accomplices, plotted to kill Mala, he said.
The accused later brought the victim to a well in Khaneta village, where Jatav and Bhagchand consumed liquor and strangulated her to death. The duo then raped her and threw the body into the well, he said.
Lakhan then filed a missing report with the Gwalior Police in an attempt to mislead the investigation, he said.
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The body was recovered about three weeks ago from the well in Khaneta village, he said.
Jatav was given Rs 20,000 by the other accused for his complicity, the Addl. SP said, adding he and Bhagchand were arrested, while Lakhan and his mother were absconding, he said.