Their evenings begin as fun celebrations with friends but they end in murder. With disturbing evidence, terrifying theories, and demands for justice, can the mystery of how two young partygoers are murdered be solved?

A young Hollywood celebrity is out celebrating her birthday and another young woman enjoys a late drink with friends, just a few hours later, they both end up dead and investigators try to solve the mystery. 

Two young brides-to-be are just beginning to plan their weddings when their dreams are tragically cut short. Can desperate calls made to 911 reveal the truth about their shocking deaths?

When two young women vanish without a trace, investigators are haunted by the things they leave behind - a car with the keys still in the ignition, a pair of shoes, and a coat. They disappear with no warning. Where have they gone?

They are head over heels in love with their whole lives ahead still ahead of them, but then they die suddenly under suspicious circumstances. Could the strange text messages that come from their own phones hold the clues that investigators need?

Two young women who dream of big success as television anchors are just embarking on their careers when their plans come to a violent end. They are murdered in their own apartments and there are no signs of forced entry. Did they know their killers?

A respected police officer heads home after a late shift, and a young man who has just moved into his own place relaxes after watching football. How do these routine evenings turn deadly? Were their killings cold-blooded assassinations?

The murders of a teenage boy who never returns home from school and a teenage girl who is ambushed as she sits in a car with friends devastate their communities. It is every parent's worst nightmare - who would kill two innocent teenagers?

They are the victims of shootings that seem senseless. Who would want them dead? Did these two young people get tangled up with the wrong crowds? And will anyone be held accountable for their murders?

After struggles in their youth, they are setting out on new paths with new hope but then the unthinkable happens. Their horrific murders are chilling. Who would kill them in such a violent way? Did they have any idea how much danger they were in?

She is an innocent bride-to-be; he's a six-year-old schoolboy. Both are on the road, away from home, when they disappear. When her car and body are found, will the clues lead to her murderer? And will his family ever solve the mystery of his vanishing?

Two 20-year-olds suffer personal tragedies then have their own lives abruptly snuffed out. He's shot while hanging out with friends; she disappears, only to turn up dead in a staged suicide. Will their families be able to prove what really happened?

Two young women are savagely murdered. One has gone fishing only to turn up beaten and drowned, and the other is a pregnant mother attacked while on the job delivering newspapers. Are strangers responsible, or are the culprits much closer to home?

One young woman is found with a shotgun wound to her head shortly after moving in with her new boyfriend. Then, a couple planning their wedding are gunned down in their own backyard. Will secrets from the past explain these unimaginable deaths?

The body of a young musician turns up in an alley. Police learn she's been spending time with an older man. Did he play a part in her murder? And when a construction worker disappears on the job, his coworkers' accounts don't add up. What are they hiding?

A mother of three is gunned down in a church basement where she's set to teach a fitness class. Police find surveillance video showing a figure in full police body armor stalking the floor in the lead-up to the slaughter. Who is this craven killer?

Sisters seek justice for their siblings - but the truth might be deadly.

Home becomes the most dangerous place on earth for two lovely young women.

A girl vanishes on her way home, and an entrepreneur dies after a fight.

A brazen public stabbing and a house fire snuff out the lives of two women.

The callously dismembered body of a missing woman turns up in trash bags.

A war veteran turns up dead, and a missing man leaves a creepy voicemail.

A beer entrepreneur is gunned down, and two friends die while on vacation.

A man relocates only to be stabbed. A student is found dead in her car.

A man and his dog burn to death. A chase ends in murder for a motorist.

A severed foot is an ominous clue in the case of a missing mother of five.

A man's trip ends badly. A missing mom's search party sparks suspicion.

One mom is missing and another spurs a manhunt for her daughter's killer.

In an ironic twist, a woman vanishes while looking for her missing friend.

When two women die suddenly under mysterious circumstances, authorities initially suspect suicide. But both of their families believe it was murder, and are trying to figure out who is responsible.

A mother of two and a young woman planning a career in science both die under mysterious circumstances, and two families embark on quests for justice.

The murder-suicide of a mother and son may be something entirely different.

A family suspects foul play when their son drowns in a few inches of water.

A rookie police officer is heard confronting someone with a gun and is shot in the back of the head, but the D.A. believes it's suicide. And when a Navy veteran is discovered with wounds all over his body, police oddly think he died of pneumonia.

He seems like a great partner. But when Susan Osborne and her 14-year-old son Evan disappear, it turns out "Mr. Right" has a secret. Then, when a young man is shot in a street confrontation, all clues point to one man. Could this case be that simple?

A young woman's body is found 200 miles from home, and a retired police detective uses his podcast to crowd-source the search for her killer. And, when a young mother disappears, an old answering machine message could hold the key to finding her murderer.

Someone snatches a baby boy from his crib, and a young mom goes missing.

A 14-year-old boy vanishes, but neighbors don't tell police what they know.

A young woman on a trip to her father's homeland goes missing, then turns up brutally murdered. Another young mother and her baby are shot as they drive along a highway.

Officers discover a high school senior's strangled body in flames weeks before graduation.

A bride-to-be vanishes weeks before her wedding. Suspicion swirls around her fiancé and ex-boyfriend, before a shocking revelation about a coworker makes him the main person of interest. Then, the mysterious death of a young trans woman.

A college student sends his sister a mysterious text about leaving the country. Later, his body turns up in a lake, weighed down by a backpack full of rocks. A young woman vanishes after trying to make a call from a payphone.

A young woman acts erratically at a restaurant and police take her into custody. They release her in the middle of the night(—)and she disappears. A soldier at Fort Hood dies after falling off a balcony. Was it an accident, suicide or murder?

The families of two young mothers who die in suspicious circumstances search for answers. Racheyl Brinson's husband says she fell to her death while hunting, while Jessica Alva's boyfriend tells police that she hung herself.

A Georgia man suffers 17 stab wounds while on a hunting trip, and authorities rule his death a suicide, shocking his family. Another man disappears without warning -- the only clue is his burned-out car, found 14 hours from where anyone saw him last.

Oakley Carlson is missing and no one can find her, including her foster parents and her biological parents; a young mother leaves a bar with a man she doesn't know and ends up dead.

A truck driver finds an unconscious woman on a Missouri motorway, and police determine the suspect attacked her elsewhere and placed her on the road; an unknown killer bludgeons a mum and her daughters at home while her son and nephew cling to life.

The murder of billionaire couple Barry and Honey Sherman in their mansion stuns Toronto, since Barry is a pharmaceutical mogul with many enemies, but it is unclear who would kill his wife; a New York teen disappears after a mysterious road trip.

A 14-year-old disappears in Aruba while on a jet ski ride with an older man; a man kidnaps a young woman from the parking lot of her boyfriend's apartment building.