Mani, a resident of village Kitna, told police he had killed his sister, aged 16, for having an affair which had incensed the family, Aggarwal said.
After strangulating her, the youth said he wrapped her body in a bedsheet and threw it in a canal, the SSP said.
Earlier, Surinder Singh, the father of the girl, had filed a report with Mahilpur police station that his daughter was missing since June 29.
After serving dinner to the family, she had left the house without informing anyone, the father said in the complaint, according to the SSP.
A few days later, a body was fished out from a canal in Kapurthala district and police called Surinder Singh's family to identify the body.
Mani went to the Rawalpindi police station but failed to identify the body.
However, during investigations Mani emerged as the main suspect and was arrested, the SSP said.
During interrogation, Mani revealed he had laced the dinner with intoxicants and went outside the house.
After consuming the dinner, the family members became unconscious and at around 1am, he strangulated Kanchan with an electric wire, he told his interrogators.
Later, he wrapped her body in a bedsheet and threw it in a canal near the village, the SSP said.
After Mani's confession, police registered a case under various sections of the IPC including 302 (murder) against him, the police officer said. (PTI)
Teen victim of honour killing
MURSHIDABAD: Her biggest fault was that she fell in love with a boy her parents didn't approve of. As a result, 16-year-old Maya Khan's throat was slit by her own cousin and her body flung away. On Saturday, police arrested her parents and the cousin for the murder.
The case of honour killing was reported from Talgram village in Murshidabad's Kandi block. Officers from Bharatpur police station had retrieved Maya's body on July 3 from the Maurakshi char. She was the daughter of Tajem Khan and Hanifa Bibi.
Investigations revealed that Tajem and Hanifa were trying to get their daughter married off to a groom of their choice. But Maya was having an affair with another local youth and despite repeated warnings she refused to break off the relationship. Her parents asked her cousin Mantu Sheikh to threaten her as well but she refused to pay heed.
It was then that the family decided that to protect their honour', the girl would have to be killed. On July 2, Mantu called Maya away from her home and took her to an abandoned house. There he slit her throat. At night, the body was dumped on the char. Police retrieved it the next day after some fishermen raised an alarm.
After hearing some eyewitness accounts, police first arrested Mantu on Friday evening. Interrogating him, police found that Mantu had murdered the girl at the behest of Maya's parents. He spilled the beans on them, saying that they could not tolerate her having an affair. Mantu also confessed to having killed his own sister after she had had an affair.
Police records showed that Mantu had been arrested in that case as well but was granted bail for lack of evidence.
On Saturday Tajem, a mason, his wife Hanifa and Mantu were produced before the Kandi ACJM and remanded in 14days' judicial custody. (TOI)