The murder sparked an international outcry and an investigation was launched, resulting in the sentencing to death in June 2011 of the deputy head of special police services Colonel Daniel Mukalay.
Three fugitive police officers, including Mwilambwe, received the same sentence in absentia, another was sentenced to life imprisonment and three more acquitted.
A retrial began in June this year and the next hearing is due to take place on October 23. The plaintiffs argue Numbi should be the chief suspect in Chebeya’s death and have demanded he be investigated afresh.
French President Francois Hollande had made stinging comments on the state of democracy and human rights in DR Congo last week, ahead of the hosting in Kinshasa of the Francophonie summit.
His criticism angered the Congolese government and Hollande went on unveil a plaque in homage to Chebeya during his brief visit to Kinshasa.