Kalai Tamilvanan, a native of the district, surrendered before Nilakottai Judicial Magistrate Regina Bervin who sent him to police custody for seven days.
Three persons had attacked 22-year old Shankar and his wife Kausalya with sickles in full public view near a bus stand in Udumalpet on March 13 allegedly at the behest of her father, a caste Hindu who was opposed to their inter-caste marriage.
Shankar died while being rushed to the hospital while Kausalya, who hails from Dindigul district, survived with head injuries.