Rabupura, a resident Madhuri, married Rahul in November and had an alleged affair with Hemant Kaushik alias Tinku, who is already married, police said.
When the woman pressurised Hemant to marry her, he strangulated her to death and buried her body in the feild on December 26, police said.
On December 23, 2016 evening she had gone missing mysteriously. Her parents had lodged a complaint against Rahul and others, they said.
Police arrested Hemant and recovered the woman's body from the feild.