Twenty-one-year-old student Christopher Jenkins dies on Halloween night in 2002, prompting an investigation into whether he fell from a bridge by accident or committed suicide; a mysterious island may hold the answer.

Twenty-three-year-old Codi Joyce ends up dead after a brawl at a house party in 2015, yet nobody has been charged for his death, and witnesses won’t talk.

College student Faith Hedgepeth is brutally murdered in 2012, with her killer remaining at large; police investigate a text message from her phone and a mysterious note left by her body.

Fifty-one-year-old Robin Pope goes missing, then, three weeks later, her decomposed body washes ashore just a mile from her ex-husband's home.

Seven-year-old Michelle Norris vanishes from a playground in 1988 and is found dead in the nearby woods four days later; clues suggest the murderer could possibly be someone who lived in the neighborhood.

A serial killer murders five young women in Honolulu, Hawaii, but is never caught; now, 30 years later, there are new clues and eyewitness accounts offering strong evidence that this case can now be solved.

Eighteen-year-old Michelle O'Keefe is murdered in a parking lot in Palmdale, Calif.; security guard Ray Jennings is convicted of killing the young woman, but he is exonerated and released from prison after serving 11 years of his sentence.

Sixteen-year-old Judy Rawlings vanishes in 2001 after a midnight ride with a friend, then her body is found in the woods a few weeks later.

In 1996, beloved teacher Norma Luobikis is found stabbed to death in her home, and evidence suggests an intimate bond between the victim and her killer.

Twenty-eight-year-old Sharon Robinson is found murdered near New Orleans; detectives suspect her abusive police officer boyfriend.

Thirty-two-year-old Rebecca Zahau's death is ruled a suicide after she is found hanging with her hands bound behind her back.

In 2015, Devan Schmidt's half-naked and bruised body is found in her home; the toxicology report indicates a possible overdose, but there are also signs of foul play.

In 2013, 22-year-old Amber Bass was gunned down in her own driveway, following a night out with friends. It is discussed whether this was just a random act of violence, or if the revelation of a love-triangle forced the hand of a jealous lover.

In 2010, Amber Jackson, 57, disappears from her Kauai, Hawaii, home, only to be found days later deep in the wilderness and bludgeoned to death.