Corey Parker had plenty of admirers, but maybe one of them liked her too much. Her murder jolted a sleepy seaside community with the chilling realization that a killer was walking among them.

When 18-year-old Anjelica 'AJ' Hadsell disappears, the investigation into her inner circle reveals a sinister betrayal.

Flight instructor Kelsey Berreth vanishes after she was last seen grocery shopping with her daughter on Thanksgiving in Woodland Park, CO; the case makes national headlines, but the secret behind Kelsey's disappearance is lurking much closer to home.

Eleven years after Waterbury, CT mother Donna Palomba is raped in her home while her children slept in 1993, investigators finally track down her attacker. Donna speaks out about the case, including her fight to keep her assailant from walking free.

A Blairsville, PA man, 39-year-old dentist and father Dr. John Yelenic, is convinced his messy divorce put a target on his back. When he's found stabbed to death in 2006, his friends and family realize he was right all along in predicting his own gruesome murder.

Firefighters make a grisly discovery of the body of 39-year-old wife and mother Carmella Knight after responding to a house fire outside Toronto. An elaborate undercover sting reveals a devious murder-for-hire plot.

After Tahereh Ghassemi disappears from the Louisiana home she shares with her adult son, detectives discover that she'd recently come into a great deal of money. The investigation reveals an astonishing plot with international implications.

Kelsie Schelling disappears one night after leaving work, leading family and investigators on a four-year hunt to find the pregnant 21-year-old; cell phone records reveal what happened to Kelsie.

27-year-old Egypt Covington is found murdered in her home. Investigators in Michigan quickly identify a person of interest, but years pass without an arrest.

When high school student Megan Nichols vanishes from her Illinois home, her mother finds a note saying that she ran away. A grisly discovery made three years later changes the course of the investigation.

An investigation into the poisoning of Wisconsin mother Julie Jenson takes a surprising turn when detectives learn that she wrote a letter days before her death pointing to a possible suspect.