Justice J B Pardiwala stayed the ongoing trial before a Special CBI court on a plea by the victim's father to recall witnesses.
Ex-MP Solanki and his nephew Shiva Solanki, who are main accused in the case, are presently out on bail.
In his petition, Jethwa's father Bhikhalal alleged that 105 out of total 195 prosecution witnesses of the case have turned hostile during the day to day hearings of the case conducted by the CBI court here till now.
Apart from issuing notice to the CBI, the Gujarat government, the high court also sought the CBI's probe report into the case.
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In his plea, Bhikhalal has alleged that these 105 witnesses have turned hostile because of the threats given by Dinu Solanki and Shiva Solanki.
"This is a classic case of accused persons successfully trying to manage the course of trial by discouraging witnesses to stand by their statement of action," said the petition.
The plea further alleged the Gujarat police and the CBI are "not serious at the ground level in ensuring protection of witnesses and completing investigation. The witnesses are threatened, coerced and pressurised by BJP MP Dinu Bogha Solanki."
Jethwa, an RTI activist was shot dead outside the Gujarat High Court premises on July 20, 2010 allegedly at the behest of then MP Solanki for exposing illegal mining activities through numerous RTI applications.
The high court had asked the CBI to re-investigate the murder after Jethwa's father Bhikhalal Jethwa approached the court expressing his dissatisfaction over investigation by the Gujarat police.
In May last year, the charges were framed in the special CBI court against Solanki and six others.
Solanki and other accused were charged under section 302 (murder) and 120 B (criminal conspiracy) among others.
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