Police said Gupta was shot at when he was on his way home and was rushed to a nearby hospital where he was declared brought dead.
Gupta was cook and personal aide of self-styled Godman Asaram Bapu, who is in jail in connection with another case of sexual assault on a minor girl.
Two sisters in Surat have accused Asaram and his son Narayan Sai of raping them. Gupta was a witness in the case of rape against Asaram and had recorded his statement before a Gandhinagar court.
PTI