The trial court convicted him alongside his firm, Slok Nigeria Limited and a former Director of Finance in Abia State, Udeogu, for allegedly stealing about N7.1 billion from the state treasury.
However, the Supreme Court, in its judgement on May 8, 2020, quashed the conviction and ordered retrial of the defendants by the EFCC.
A seven-man panel of Justices of the apex court, in a unanimous decision, nullified the entire proceedings that led to conviction of the defendants, stressing that the then trial judge, Justice Mohammed Idris, was already elevated to the Court of Appeal at the time he sat and delivered judgement against the defendants.
It noted that Justice Idris was no longer a judge of the Federal High Court as at December 5, 2019, the day the former governor and his co-defendants were found guilty of the money laundering charge against them.
According to the Supreme Court, Justice Idris, having been elevated to the Court of Appeal before then, lacked the powers to return to sit as a High Court Judge.
It, therefore, ordered that the charge in suit No. FHC/ABJ/CR/26/2017, which EFCC entered against Kalu and his co-defendants, be remitted back to Chief Judge of the Federal High Court for re-assignment to any other judge for the trial to commence de-novo (afresh).
Though the initial trial took place in Lagos, CJ of the High Court however transferred the case file to Abuja for retrial.
Dissatisfied with the action, the EFCC, in two separate letters it wrote to CJ of the court, demanded that the case be transferred back to Lagos.
Meanwhile, the new trial judge in the matter, Justice Ekwo, had in a judgement he delivered on September 29, barred the Federal Government from further prosecuting Kalu and his firm, based on the money laundering charge EFCC preferred against them.
He held that the Supreme Court had in its judgement, only ordered the retrial of Kalu’s co-defendant, Udeogu.
Justice Ekwo held that the Supreme Court could not have ordered Kalu’s retrial, since it was Udeogu that lodged an appeal before it.
He maintained that allowing the EFCC to retry Kalu who is currently the Chief Whip of the Senate, and his firm, would amount to violation of section 36(9) and (10) of the 1999 Constitution, as amended, as well as section 283 of the Administration of Criminal Justice Act, ACJA, 2015.