When beloved store manager Mary Peterson is found stabbed to death in her bed, storm clouds brew over sunny Lakeland, Florida. Cops race through a lengthy list of suspects, but a tip from an unlikely source helps nab the cold-blooded killer.

Season 3, Episode 1 originally aired on ID on 12/4/2012.

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When friendly cashier Tammy Petrin is found shot execution style at the local burger joint, the town of Woonsocket's in shock. After lead suspects don't serve up answers, a helpful hooker and letters from jail might be just what detectives ordered.

Season 3, Episode 1 originally aired on ID on 12/18/2012.

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When the body of 18-year-old Breanna Schneller is discovered in her apartment, the residents of tranquil Wausau, Wisconsin are stunned. Police hope a cell phone and surveillance videos can help them unravel the mystery surrounding Breanna's death.

Season 1, Episode 20 originally aired on ID on January 8, 2012.

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A small town is jolted awake when 31 year old Laura Wynn is found dead in her home. And when a double homicide hits a nearby town, people are terrified. Thirteen years later their fears are confirmed when DNA proves the killer lives among them.

Season 1, Episode 19 originally aired on ID on September 15, 2011. 

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When Jerry Martin is found brutally murdered in 1975, the city of Tulsa is left in fear. And with no solid leads, ignorance as well. It takes detectives more than 25 years and new DNA evidence more than 1000 miles away to warm up this cold case.

Season 1, Episode 18 originally aired on ID on January 29, 2012.

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After beloved custodian James Mayberry is found stabbed to death in his Wichita home, the folks of the Midwestern town are in shock. Detectives are stumped until a break comes faster than a prairie tornado that pins down the heartless killer.

Season 2, Episode 17 originally aired on ID on 7/22/2012

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The brutal slaying of 32-year-old Stacie Ann Smith, a single mother, has the townsfolk of St. Albans, West Virginia, reeling. The murderer's message at the crime scene baffles investigators and citizens are shocked that a killer lives in their midst.

Season 2, Episode 16 originally aired on ID on 6/24/2012.

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The sleepy town of Graham gets a jolt when newlyweds Brian and Beverly Mauck are found shot dead in their home. Leads from friends and family send police on a wild goose chase. But cops soon find out one helpful tipster is the ruthless killer.

Season 2, Episode 15 originally aired on ID on 7/8/2012.

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84-year-old Charles Taylor's grisly murder has the entire city of Warren, Michigan, in disarray. Investigators are taken on a wild ride and are forced to eliminate a swath of suspects, only to be stunned by the true identity of a callous murderer.

Season 2, Episode 14 originally aired on ID on 7/11/2012

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When Norm Leighton and Patti Hubbert, a peaceful older couple, is violently murdered, locals fear quiet Billings, Montana, is turning into the Wild West. And when the couple's neighbor turns up dead, police are off on a wild ride to solve the case.

Season 2, Episode 13 originally aired on ID on 7/1/2012.

Stream full episodes of Nightmare Next Door on discovery+. Go to discoveryplus.com/nightmarenextdoor to start your 7-day free trial today. Terms apply.

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