Dateline NBC

The investigation into the death of a pregnant woman reveals secret lives and feuds.

A well-known woman from a prominent family is found dead in her home, located in a resort town.

A wife and mother survives an attack in her home and a shot to the head.

After a young Army veteran disappears, detectives uncover a cryptic 911 call placed 11 days before she went missing, which exposes a twisted story -- and the truth.

Over the course of a year, violent crimes are committed against two women from the same church.

After a young father is found dead in his home in Jonesboro, Ark., the authorities search for the killer.

When police find a prominent lawyer dead and his girlfriend bound in duct tape, their investigation leads to a surprising suspect.

Months after a woman and her husband come down with the same mysterious illness, the woman dies after experiencing the same symptoms; old recordings reveal the twisted truth about her demise.

Campus cops make a terrible discovery in a dorm room after a boyfriend's weekend visit goes horribly wrong.

Authorities in the Pacific Northwest investigate the disappearance of a young mother.

Authorities work to establish why a loving mother was brutally stabbed to death in her home.

Police suspect a serial killer when two women and their teenage daughters are murdered.

A woman seeks the truth when her whirlwind romance turns into a mystery involving government agents.

The investigation into the death of a college student leads authorities to her theater group.

A chance encounter by custom agents leads to a break in the case of a mother who disappeared days before she was supposed to move to a new city with her young son; 20 years after the incident, a witness speaks out.

Cops suspect a murder-for-hire plot when a realtor is attacked and left for dead at a home showing.

Investigators seek answers when a prosecutor and a district attorney and his wife are murdered.

Six survivors of the 2012 Costa Concordia shipwreck share their stories.

The suspected killer of a California housewife claims it was a burglary gone awry.

A look through the eyes of more than a dozen survivors of California's largest wildfire.

The 2006 poisoning death of former Russian spy and businessman Alexander Litvinenko.

A young art student from Texas is found murdered in her bed with no sign of forced entry.

Survivors of the 2004 tsunami that hit Thailand -- including Petra Nemcova -- share their stories.

The murder of a California mother beloved by four men reopens a mystery surrounding another young woman's death that occurred decades earlier.

Computer antivirus pioneer John McAfee discusses his new business.

After a successful young doctor collapses, a blood test reveals cyanide poisoning, resulting in a criminal investigation.

After shedding hundreds of pounds, a popular kindergarten teacher goes missing.

A Georgia couple's romantic tryst takes a deadly turn, leaving investigators stumped -- until tire treads at the scene and cell phone calls reveal a twisted plot.

A love triangle is uncovered after a doctor ingests a lethal chemical.

A car belonging to a missing man erupts in a blaze, leading to clues regarding his whereabouts.

When a woman is found murdered in her bed, her husband and her son accuse each other of being the killer.

Suspicions arise when a man's wife dies in a house fire and then a second tragedy claims his son's life.

A matriarch's death leads to a prominent family from Texas being torn apart by decades of betrayal, greed and mistrust.

The disappearance of a 20-year-old honors student ends up taking decades to solve.

A foreign exchange student and soccer player's participation in a dangerous game leads to deadly consequences.

When a mother is murdered in a home invasion the day before her best friend is shot outside the place they both worked, investigators suspect the crimes are linked.

A determined investigator works with a prosecutor in hope of solving a 20-year-old murder case.

Investigators follow the trail of a seemingly untraceable late-night call as they search for the killer of businesswoman Peggy Nadell.

A woman suspects poisoning when she finds her husband of five months dead on the bedroom floor with no clue as to what happened.

Robert Durst's recent arrest in New Orleans and his whereabouts over the past 30 years.

When a luxury car dealer is found dead, detectives suspect one of his lovers.

A woman kills the man she suspects of being involved in an attack on her husband and young son.

A woman who rose from poverty and became a successful criminal defense attorney is murdered.

A DNA breakthrough in a murder case that is more than a decade old leads two determined detectives to surprising suspects.

After losing a hotly contested custody battle, a woman disappears with her 11-month-old daughter.

When Tom Foley becomes the top suspect in his wife's murder, he spends the next two years trying to prove his innocence.

A man from Iowa is shot to death while sleeping in bed next to his fiancée.