Ballu Khan and his lawyer have denied he had anything to do with the plot to assasinate Frank Banimarama and say he should should not have even been mentioned in the court case against the eight men, who have been found guilty of trying to kill the military leader.
In delivering the verdict of the five assessors, Justice Madigan said: "I am satisfied beyond reasonable doubt each of you conspired with others and Ballu Khan to murder Commodore Bainimarama."
A short time ago, Khan told TV One News the claim was outrageous.
Earlier, he told other media: "We never planned anything, they [the military] came up with the plan and it was like they themselves were planning something. We were the collateral in case something went wrong."
Khan was arrested and severely beaten by authorities two years ago, but won a permanent stay of proceedings against him.
In theory, he cannot be retried, but Fiji courts are working by military decree now and Justice Madigan was appointed under those circumstances.
Justice Madigan accepted evidence from Fiji Military Intelligence that Khan was going to use arms and explosives from New Zealand.
The Fiji High Court was also told the New Zealand High Commission knew of the plot and supported it. The plotting was said to have taken place in Mr Khan's Suva home, which he denies.
Khan's New Zealand lawyer, Peter Williams, QC, travelled to Fiji to help secure Khan's release and bring him back to Auckland. Tonight, he supported Khan's comment the Fiji High Court had no legal evidence to connect him to the failed assasination plot.