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.

Must Read: Celina Cass Mysterious Death: $30,000 Reward Announced as Police Hunt For Clues

Must Read: Celina Cass: Inconclusive autopsy report deepens mystery

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Celina Cass
Celina Cass, age 11, was last seen the night of July 25 in her New Hampshire home. Europaplustv
An image shows the late 2-year-old Caylee Anthony with her mother Casey at the Orange County Courthouse in Orlando Florida
An image displayed on a courtroom monitor shows a photo entered into evidence in the Casey Anthony trial showing the late 2-year-old Caylee Anthony with her mother Casey at the Orange County Courthouse on Friday, June 10, 2011. Celebrity medical examiner Jan Garavaglia testified on Friday that bones scattered in woods near Anthony's home were positively identified as those of her 2-year-old daughter Caylee. REUTERS
Jaycee Dugard undated handout photo
Jaycee Dugard is seen in this undated handout photo. Dugard, who was kidnapped in 1991 at the age of 11 turned up at a California police station, authorities said, and a couple accused of abducting her has reportedly been arrested. She had been missing since she was abducted near her home in South Lake Tahoe on June 10, 1991 by two people in a gray sedan. REUTERS
Leiby Kletzky
Leiby Kletzky, an 8-year-old boy Brooklyn boy, was kidnapped and murdered last month. REUTERS
Austrian kidnap victim Natascha Kampusch poses with her book 3,096 Days during a photo call in a bookstore in Vienna
Austrian kidnap victim Natascha Kampusch poses with her book 3,096 Days during a photo call in a bookstore in Vienna September 9, 2010. Kampusch's memoirs, which appeared in Vienna on Tuesday, recounts how her captor Wolfgang Priklopil starved her, beat her so badly that she could not lie on her back and forced her to clean his house half naked, calling her his slave. REUTERS