When Dr. Teresa Sievers is found murdered in her kitchen, detectives struggle to find any leads until an unexpected tip changes everything; the woman who helped investigators speaks out.

After New Jersey mother Michelle Lodzinski reports that her 5-year-old son has vanished from a carnival, detectives embark on a decades-long investigation until a family member identifies a key piece of evidence pointing to a potential suspect.

After Florida teacher Denise Hallowell is found murdered in her home, investigators examine her family's tumultuous past in their desperate search for a killer.

After the cause of the death of Stacy Feldman in her Denver home is ruled as undetermined, friends and family join forces to piece together what happened. Insiders close to the case speak out about the seven-year battle for justice.