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"48 Hours" investigates the final hours of Cayley Mandadi

In the coming months, a re-trial is scheduled in the case of Cayley Mandadi, a San Antonio cheerleader and college student. Prosecutors allege she was beaten to death by her boyfriend, Mark Howerton. But the defense has other explanations as to how she could have died. "48 Hours" correspondent Peter Van Sant joined CBSN to discuss the murder case and preview this Saturday's episode.

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