Recently divorced mom-of-three Ingrid Lyne goes back into the dating scene and meets a man online, but her date at a baseball game will be her last; Seattle residents and investigators are shocked by a chilling crime scene.

Mike Williams mysteriously disappears on his wedding anniversary, and it looks like he may have been eaten by alligators, but looks can be deceiving; a break in the case reveals secrets.

Colorado soccer mom Paige Birgfeld vanishes and a small town is left on edge; cops dig for clues and make a shocking discovery that this devoted mom is living a secret double life.

A pregnant elementary school teacher disappears and her boyfriend goes in front of TV cameras and tearfully pleads for her return, but investigators soon discover the grieving boyfriend may have more than one reason to cry.

A married Google executive is found dead on his luxury yacht and those close to him are left baffled when the autopsy results are released; the only clue into Forrest Hayes’ death is a sexy woman seen on the boat’s surveillance.

Churchgoers know something is up when pastor Matthew Winkler doesn’t show up for services: he’s found dead on his bedroom floor and twisted sex fantasies and dark family secrets start to surface. [also shown as S1:E4]

Mother of two Crystal McDowell vanishes as Hurricane Harvey rocks Houston; surveillance video leads investigators to her twisted killer.

Former model, Samira Frasch, was living a life of extravagance until tragedy struck; the mother of two is found dead at the bottom of her swimming pool and both her children are missing from the home.

Successful doctor and mom of two, Teresa Sievers, is found bludgeoned to death in her kitchen after returning home from a family vacation.

The bodies of two young women found dead in suitcases on the side of the road lead investigators to a former cop with a double life and a stunning confession.

A 41-year-old mother of three was brutally stabbed nearly 200 times in front of her two youngest children; investigators reveal a sick and twisted motive behind the deadly rampage, and her daughter who witnessed the attack speaks for the first time.

Newlywed Lauren Phelps is stabbed 123 times as she fights for her life; her killer may blame his deadly rampage on cold medicine.

After Florida mother Gretchen Anthony, 51, goes missing from her home, surveillance video tells a twisted tale of her final hours.

A romantic and scenic early morning boat ride turns deadly when Larry Isenberg falls overboard; investigators reveal the disappearance of half a million dollars, which could be motive for murder.

24-year-old Alex Woodworth is brutally stabbed 16 times and left for dead hanging halfway out of the killer's car; as investigators peel back the layers, it's revealed the killer's many lovers is motive for murder.

A routine purchase may lead police to the killer of Laura Ackerson, a young mother whose body parts surface in an alligator-infested creek 1,200 miles away from where she was last seen.

Police find Jenny Webb hanging in an apparent suicide just days from giving birth to her first child; when things don't add up, investigators wonder if an unraveling love triangle and an unexpected pregnancy acted as a motive for murder.

An 8-year-old girl discovers her mother brutally bludgeoned to death in her home after her mom’s shift at a Vegas casino; police turn to surveillance video hoping to reveal the killers.

A killer stabs devoted father Jeff Wright 193 times and buries him in the backyard of his own home; investigators examine his background and their quest to find the culprit.

A desperate wife dials 911 to report a robbery after finding her husband, a father of three, shot in bed; evidence at the scene quickly leads investigators to the killer.

The brutal and public stabbing of a young high school teen shocks the community, and police quickly unravel the crime and motive through threatening voicemails and a long-simmering rivalry.

Tattoo shop owner Dennis Abrahamsen is found brutally murdered and naked on a massage table in his home; evidence tells a story of a wild sex party gone wrong with a famous adult actress.

Aspiring cosmetologist Shannon Graves is found dismembered inside a padlocked freezer but when another woman is spotted driving her car and going into her apartment, detectives discover a chilling cover-up.

A successful lawyer, Mormon family man, and father of five is shot down in cold blood at a Walgreens parking lot, but a closer look reveals a dirty office affair that turned into a dangerous game of Russian roulette.