(ANSA) - ROME, NOV 18 - The sister of Giulia Cecchetting, a 22-year-old student brutally murdered by her university coursemate Filippo Turetta a year ago, said Monday she had been killed by an apparently "decent white boy" after Education Minister Giuseppe Valditara told the presentation of her new foundation that a rise in sexual violence in Italy was linked to illegal immigration. (ANSA).