Distraught mom: 'This is no accident! My son was murdered!'

After Tyler Smith was found dead in the shallow water of a cement canal in Galesburg, Illinois, last September, investigators concluded it was an accidental drowning. But the parents of the 23-year-old aspiring police officer believe foul play was involved in the death and they are demanding answers. Mom Sandy Halsne and dad Keith Smith called Nancy Grace for help. Nancy assembled a panel of experts including South Carolina medical examiner Dr. Michell Dupre -- author of "Homicide Investigation Field Guide," Cold Case Research Institute director Sheryl McCollum, Atlanta juvenile judge & lawyer Ashley Willcott, and Crime Stories reporter John Lemley.

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