On 11 November 2007, a Lazio supporter, Gabriele Sandri was fatally wounded in an argument between Lazio and Juventus supporters, resulting in the police intervening and ultimately killing Sandri, who was not directly involved with the quarrel.

Source: Stadio Olimpico article: May 13, 2008

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L'uccisione di Gabriele Sandri una giornata buia della Repubblica (in Italian).