An Argentine judge has ruled the death of a top prosecutor to have been a homicide, overturning an initial report that described the death as a suicide. Alberto Nisman was found death of a gunshot wound in his Buenos Aires apartment in January 2015. He had been scheduled to testify against the country's then-president Cristina Fernández de Kirchner the next day, accusing her of covering up Iranian influence in a 1994 bombing at a Buenos Aires Jewish center. Kirchner's government initially ruled the death a suicide. But judge Julián Ercolini ruled on Tuesday that Nisman could not have fired the fatal shot. Ercolini charged one of Nisman's former aides as accessory to the murder. The former aide, Diego Lagomarsino, owned the murder weapon and was the last person in Nisman's apartment the night of his death, Ercolini said.