Federal High Court sitting in Lagos on Tuesday gave an order for immediate release of Sen. Orji Uzor Kalu, the senator representing Abia North.
Kalu, a former governor of Abia state has been in Kuje Correctional facility since December last year after he was convicted on allegations bordering on corruption.
The Supreme Court last month upturned the conviction for not following due process.
Justice Mohammed Liman on Tuesday gave the order in an ex-parte ruling after listening to the suit filed by the legal team of the former governor Led by Lateef Fagbemi (SAN).
Sen. Kalu is the current Senate Chief Whip.