The couple was murdered at their rented home in Tuticorin, the police said.
A newly married couple was hacked to death by the woman's father for marrying against the family's wishes in Tamil Nadu.
The incident was reported from the port city of Tuticorin in Thoothukudi district.
After the couple got married, the woman's family filed a missing complaint. The couple appeared before the police in Madurai stating they were both adults and married by choice.
"The couple - Manickaraj and Reshma- also spoke to the woman's parents on a video call from the station. They never sought police protection," Balaji Saravanan, a senior cop in Tuticorin, told NDTV.
The village elders had also intervened and had asked the family to stop haranguing them.
The couple was murdered at their rented home, the police official said, adding that the woman's father later surrendered.
"The couple belong to the same scheduled caste and are related. The woman is a college student and her husband didn't study after school. This was a major issue for the woman's family," police officials told NDTV.
The woman's father has been arrested said officials, adding that an investigation has been launched into the matter.