The Pink Panther(2006)
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Inspector Clouseau finds the real killer: the soccer trainer. He stabbed the coach with a poison dart because of the way he was treated during his years training the team. As for the infamous diamond, the coach gave it to girlfriend Xania (Beyonce Knowles) moments before his death. Xania is therefore the rightful owner. She has it in her posession for the duration of the film.
Cheers, Matthew!
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