Dateline on ID - Season 9

Special education teacher Frank Rodriguez is a U.S. Navy veteran with few enemies, then he dies under mysterious circumstances, leaving investigators with the challenge of figuring out how he died and who would want him dead.

After Lisa Knoefel is stabbed to death, her teenage foster daughter, Sabrina Zunich, admits to killing her, but the case grows infinitely more complicated when Lisa's husband, Kevin, is implicated in the crime.

After car salesman Eric Somuah is found shot to death in his bed, a dogged detective refuses to give up on the investigation into his murder which is filled with twists and turns.

Chiquita Tate was growing her reputation as a tenacious defense attorney but her promising career came to a violent end when she was murdered. Because she dealt with so many tough characters, police had a challenge. Or was her killer closer to home?

Marc Despain was a married father of two and a successful real estate appraiser. He was busy building a life, until his ended all too soon. Was money the motive? A family rift? Or something else? His family wanted answers and so did investigators.

The Harkey name was famous for pecan harvesting in Texas. So when the matriarch with a powerful grip on the family fortune went missing, investigators focused on the family tree. Turns out, the plot was more tangled than the branches of a pecan tree.

Lynn Friend was a devoted mother with wedding plans when she vanished into thin air. Was she a runaway bride, or had she run into trouble? Investigators searched land and sea, going to unexpected depths to solve the mystery.

A seemingly healthy doctor collapses at home and is rushed to the emergency room, where a blood test reveals she has been the victim of cyanide poisoning, turning a medical mystery into a murder mystery.

A doctor fights for his life after being poisoned, and police uncover more than one suspect while looking into the women in the victim's life and must ask themselves which one is toxic.

After Jennifer Ramsaran goes missing, detectives suspect she may have been harmed by someone she met online, then they realize the answer to her disappearance may lie closer to home.

In Miami, Cindy Carballo's husband is shot to death while walking with their baby boy in his arms, then, a short time later, Carballo kills her late husband's business partner.

After a college freshman is beaten to death, identifying the victim will turn out to be more difficult than finding the killer, who confesses to committing the crime for a reason that will later become the foundation for his defense.

Police discover a chilling connection between two victims and race to connect the dots to see if they have a serial killer on their hands.

After a bizarre murder case goes cold, investigators get a DNA hit but cannot figure out the link between the victim and her suspected killer who are separated by 1,5000 miles.

A 33-year-old tutor is accused of having an illicit relationship with a teenage student after a racy photograph is discovered on a cell phone; later, her stunning defense will lead to an emotional courtroom battle.

In Southern California, a nurse is butchered in a murder so savage it haunts detectives for more than three decades.

In Southern California, a nurse is butchered in a murder so savage it haunts detectives for more than three decades.

After baby Savanna vanishes during a custody battle, her father is driven to find out what happened to her; the mystery of her disappearance spans two decades and circles the globe.

Respected psychology professor Patricia Esparza believes she has escaped from a life of poverty and abuse, until a dark secret comes back to haunt her as the result of a determined investigator's work on a 20-year-old murder case.

After the brutal murder of a wealthy socialite, police zero in on a suspect but solving this crime will not be easy or quick.

Vern Holbrook has a beautiful family and a thriving real estate company, then he fails to show up for a meeting with his daughter-in-law, leading to concern over the whereabouts of the beloved patriarch.

Part 1 of 2. The death of a real-estate developer, who was killed by a car bomb at a posh resort, is investigated.

Conclusion. The death of a real-estate developer, who was killed by a car bomb at a posh resort, is investigated.

The case of Johnny Hincapie, imprisoned for 25 years for the 1990 New York City subway stabbing death of a Utah tourist, is examined. In 2015, a judge overturned his conviction and ordered a retrial due to new evidence.

The death of a retired corrections officer from antifreeze poisoning is investigated.

A Georgia couple's Valentine's Day tryst takes a deadly turn. Before long, crime-scene tire treads and a series of cell-phone calls reveal a scheme of deceit and murder.

A teenager is found dead the morning after inviting a friend to sleep over in her basement.

What happened one spring night at an elite New England preparatory school leads to an accusation of sexual assault and an investigation into who is telling the truth.

While members of the U.S. military prize loyalty, a female commander's murder comes about as the result of a breathtaking betrayal.

Twenty-nine-year old Carrie Olson has a new man in her life and is looking forward to the future, then she goes missing, and no one can imagine anyone wanting to harm her.

The morning after a cast party, 19-year-old musician and actress Jessie Blodgett is found strangled to death in her bed.

Sabine Buehler moves to an island off Florida seeking her own slice of paradise, then she vanishes, leading police down a long and winding path in the sand as they investigate her disappearance.