According to CNN-IBN, Shiva Solanki is the nephew of BJP MP Dinubhai Boghabhai Solanki.
Ahmedabad Police Crime Branch also arrested three other people along with Solanki on Monday, Aug 16.
RTI activist, Jethwa was killed on Jul 20 near Gujarat High Court. Ahmedabad police official said that some unidentified men on a motorcycle fired at Jethwa.
Jethwa filed several petitions in the Gujarat High Court against the forest department and had also filed a a public interest litigation (PIL) on the illegal mining in the Gir forests of Junagadh district.