In a brutal attack on a newly married couple by the woman's brother, the man was killed on the spot in Mettupalayam in Coimbatore district on Tuesday evening, police said. The woman is in critical condition.
The victims have been identified as Kanakaraj and Dharshini, both from the Scheduled Caste community.
The Mettupalayam police have registered a case under the relevant sections of the law.
Darshini's brother attacked the couple with a knife as soon as the two returned home after tying the knot at a temple on Tuesday.
Further investigations are underway.