Who killed Shido Itsuka?

Could you please elaborate on the mysterious circumstances surrounding the death of Shido Itsuka? Who could have possibly had the motive and the means to carry out such a heinous act? Was it a personal vendetta, a professional rivalry, or perhaps a crime of passion? The question lingers in the minds of many, as the investigation into his untimely demise continues to unfold. What clues have been uncovered so far, and what leads are the authorities currently pursuing? The world awaits answers as the search for the truth behind Shido Itsuka's murder intensifies.