Season 4

When 18-year-old Breanna Schneller is discovered stabbed to death and her throat slashed in her apartment where she lived with her fiancé and his brother, the residents of tranquil Wausau, WI, are stunned. Police hope a cell phone and surveillance videos can help them unravel the mystery surrounding Breanna's death.

The bloody murder of Beth Grosskopf in 2009 leaves the town of Freedom, PA, riddled with fear. Hopes for quick justice are dashed when the initial suspects don't pan out. But when someone reveals his inner demons, cops move in to catch the killer.

When accountant and two-time divorcee Geraldine 'Jerry' Martin goes missing, and is later found viciously murdered and mutilated in 1975, the city of Tulsa, OK, is left in fear. With no solid leads, it takes detectives more than 25 years and new DNA evidence more than 1000 miles away to warm up this cold case.

When 25-year-old Amy St. Laurent disappears after a night out on the town in 2001, the people of Portland, ME, are terrified. With no body, police don't know what to make of it. But their worst fears are confirmed when a shocking discovery proves murder.

The residents of the small town of Navasota, TX, are horrified when a pillar of their community, 54-year-old funeral home owner Lonnie Turner Sr., is found shot dead in his home. As investigators dig into the case, they discover this brutal murder may be a family affair.

The gruesome slaying of adored resident and wife 48-year-old Debra Rawls in 2004 leaves the small town of Summerfield, FL, paralyzed with fear. A swath of hooligans quickly deepens the suspect pool, but a speck of blood makes the biggest splash in discovering the true identity of the killer.

When Goshen, NH, resident 55-year-old Edith 'Pen' Meyer goes missing, the tiny vacation town fears the worst. Police find leads, but can't find the body. When a notorious resident reveals a grudge, police move in quickly to catch a killer.

When 34-year-old single mom of three Joanna Presti and her 12-year-old daughter, Alyssa, are found slain in their Woburn, MA, home, police sift through exes and neighbors to nab their murderer. But when a mysterious photo is found in the Presti home, a killer is exposed.

Residents are struck with fear in 1981 when 21-year-old Southern Illinois University senior Susan Schumake is found raped and strangled to death on campus in Carbondale, IL. Lack of evidence stumps cops for more than two decades, but new technology leads detectives in a direction they never expected.

The July 4, 1999 discovery of the charred remains of 30-year-old construction business owner Troy Temar in Lebanon, OH, rattles the nerves of its residents. Police are led astray for 6 years until an accomplice's confession exposes a sinister plot orchestrated by a devious killer linked to Troy's past.

On July 4, 1996, 9-year-old Cyndi Allinger doesn't show up for dinner and her mom fears the worst. Is a predator stalking the school-age children of scenic Lakewood, WA? The most likely tip comes from the least likely witnesses, and leads to Cyndi's killer.

Shoreline, WA is shattered when 43-year-old nurse Renee Powell is murdered and her home set afire. When the killer strikes again exactly 30 days later with the same M.O., police fear they have a serial killer on their hands. But the trail grows cold and it takes a jilted lover to shake this case loose.

A dream life ends when pretty mom-to-be Kelsey Monahon is found hogtied and beaten in her beachfront home.At first, the bizarre scene looks like a home invasion, but detectives dig deeper and turn up a trio of unlikely suspects including Kelsey's husband.