A PCR call was received at Madhu Vihar police station yesterday afternoon about the body of the victim found in her house at Hasanpur village.
The policemen found the body of the girl lying on bed of her room. Injury marks on neck and bruises on hand were also found.
There was no evidence of forceful entry in the house and nothing was ransacked, Omvir Singh, DCP (east) said, adding that the killer had tried to give the murder the shape of suicide.
The accused told police that he first strangulated the girl with her 'Chunni' and thereafter chocked her nose and mouth to ensure her death.
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It was also revealed that she was living with his family in Hasanpur village since 2008 after death of her father when she was just 10-year-old.
She was brought up by his parents and the responsibility of her marriage lay on him as he was the sole bread winner of the family.