This comes despite the fact that the billionaire kidnapper had initially pleaded "guilty" at his first trial appearance.
Better known as Evans, Onwuamadike is facing a two-count charge of kidnapping and conspiracy to commit felony at a Lagos High Court.
Evans and five others were brought to court this morning in cuffs.
He pleaded guilty to the charges when he appeared in court in August, but at today's proceeding, Evans and five other accused pleaded "not guilty".
Others are Uche Amadi, Okwuchukwu Nwachukwu, Chilaka Ifeanyi and Victor Chukwunonso Aduba, second, fourth, fifth and sixth defendants respectively.
The court was later adjourned to November 3 on the request of some of the lawyers just joining the defence team to be given time to study the proof of evidence against the defendants.
Lagos State Director of Public Prosecution (DPP), Titilayo Shitta-Bey, had when the matter came up in court on Thursday, informed the trial judge, Justice Hakeem Oshodi, that the amendment relates only to the punishment section for the second charge.
According to the prosecution, the defendants between February 14 and April 12 at Obokun Street, Ilupeju, while armed with guns and other risky weapons, captured and detained Duru.
The amended charges have been read to all six defendants and they all pleaded not guilty after the court reconvened at 11:am.
According to the prosecutor, the defendants collected a ransom of 223,000 Euros for the release of Donatus.
NAIJ.com was present at the court premises and witnessed the arrival of Justice O.H. Oshodi at criminal court 18, the same place where the first trial commenced.
The suspect was said to have run to the roof of the house for emergency exit but the police caught up with him.