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.

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.

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.

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