Ashu Sharma (24) allegedly killed Mamta (30) at her residence on July 24 after she refused to have physical relations with him, DCP (Outer District) B S Jaiswal said. Acting on a tip-off, Ashu was nabbed from his sister's house at Poothkalan area.
During interrogation, Ashu confessed to his crime and said he wanted to have physical relations with the victim, but she refused his proposal and in a fit of rage he smothered her and fled from the house, police said.
Ashu is a cousin of the victim's husband Sajjan Singh and has been staying at his house since the past one year.
The official said the deceased children were at the house when she was killed. The children informed the police that they have seen Ashu locking the door after entering into their mother's bedroom.
Ashu hails from Sonepat district in Haryana and used to work as a clerk at a a private company located in Alipur.