Former police informer witnessed the kidnapping of the three, their murder and the dumping of their bodies.
Peter Ngugi is jointly charged with four police officers with murdering the human rights lawyer.
A former police informer has admitted before a judge that he was instructed to spy on a suspect who was later murdered alongside human rights lawyer Willie Kimani and a taxi-driver, and their bodies dumped in a river five years ago.
Appearing before Justice Jessie Lesiit, Mr Peter Ngugi gave a graphic account of the events of June 23, 2016. He said he went to the Mavoko Law Courts, witnessed the kidnapping of the three men, drove the taxi belonging to Joseph Muiruri and abandoned it in Limuru, and saw the dumping of the three bodies in Athi River in Donyo Sabuk, Machakos County.
