The mystery behind the disappearance and death of 11-year old girl Celina Cass has stumped authorities, even as her death has left her family and friends in mourning. The autopsy is scheduled for Aug. 2, and her family is hoping that it could yield some answers to her passing.

The recent increase in number of high-profile abused, missing or murdered children cases, such as Celina Cass, Ame Deal, Leiby Kletzky Zahra Baker and others has shocked millions.

Start the slideshow to view some of these tragic, and some would say potentially avoidable, cases.

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