On a rainy evening Tuesday 18th January, dozens toured the streets of Buenos Aires in memory of the prosecutor Alberto Nisman on the occasion of the seventh anniversary of his death, a case which remains unresolved by Argentine justice. With umbrellas, dressed in black some carrying candles, flashlights, and flowers, the march reached the Le Parc flats complex, in a posh area of Buenos Aires, where Nisman was found dead with a shot in the head, and an investigation that still has to decide if it was a homicide or suicide.