Counsel for the complainant T Swetha contended that all the accused had trespassed into the house of the complainant and abducted them by force.
The accused confessed that they committed the crime to avenge the disgrace the woman brought to the family by marrying a man from another caste.
The woman's brother had threatened Suresh Kumar with dire consequences if he failed to sever ties with his sister.
The man belonged to a Scheduled Caste and the girl to an Other Backward Classes community.
The police suspect that the victim may have been killed by members of a right-wing organisation who had accused the dead of seducing a girl from another caste.
The court awarded a death sentence to one person and life sentences to 12 others, including a former deputy superintendent of police and an inspector.
Two policemen -- former DSP Chellamuthu and inspector Tamilmaran -- were among those sentenced to life imprisonment
'Killing For Honour... A Culture of Silence' is authored by Puneet Kaur Grewal who is working as the State Project Coordinator in the women and child development department of Haryana.
Kerala youth Amit Nair, who married Jaipur-based Mamta of other caste against the wishes of her parents and brother in 2015, was shot dead allegedly by a hired killer in 2017.
After the incident on August 2, the family members tried to pass it off as a case of suicide, but the forensic report refuted their claim, following which the woman's father and brother were arrested.
A bench headed by Chief Justice N V Ramana termed as "unsustainable" the bail granted to accused Mukesh Choudhary, brother-in-law of deceased Amit Nair.
A bench headed by Chief Justice N V Ramana asked accused Mukesh Choudhary, brother-in-law of deceased Amit Nair, to surrender before the trial court.
The court, which had earlier cancelled the bail of accused Mukesh Choudhary, brother-in-law of deceased Amit Nair, was irked over the fact that the benefit of bail was granted to him.
The accused identified as Sukhjinder Singh, a resident of Balarwal village in Batala, got enraged when he came to know about his daughter's love affair with one Germanjeet Singh.
While the 23-year-old man died on the spot, his 19-year-old wife, who received 4-5 shots, is battling for life in a hospital.