The accused, lodged in three different jails, were produced before the Principal District Judge, Alamelu Natarajan.
The judge directed that they be produced in court again on June 13.
Shankar was hacked to death by a three-member gang when he and his wife Kausalya were standing at the Udumalpet Bus stand on March 13.
The accused include the parents of Kausalya.
The murder was said to be a suspected honour killing, as the couple belonged to different castes.