A Russian college student falls for a man who is still in love with an old flame; a Texas heartthrob goes missing.

Kimberly Tetz finds herself on the losing end of a deadly ultimatum; pianist Tom Whitney's love story ends on a sour note.

A husband runs to another woman; a lonely husband strays.

Jonathon Nyce had it all until his wife has an affair with the local landscaper; an affair with a repairman destroys a happy marriage.

In Sioux Falls, S.D., a woman finds love within the deaf community until a jealous friend interferes; a love triangle results in heavy turbulence.

Robert Marshall's wife hires a private investigator to catch him in the act of cheating on her with his mistress; a couple's passion is put in jeopardy by a younger man.

An international dalliance has deadly consequences for a California family man; an unlikely love triangle ends in murder.

A man and his wife get caught up in a dangerous game; Patricia Swinehart's scandalous love affair with her husband's nephew takes a murderous turn.

A Florida man has a whirlwind romance with a flight attendant that leads to betrayal and murder; in Seattle, a disappearance brings to light the truth about a picture-perfect family.

A shootout at a rural Kentucky home baffles the community; for a Miami couple, life in the fast lane ends in a fiery crash.

A stormy suburban marriage ends in the wife's disappearance; a family is rocked by two tragic deaths that leave their small town reeling.

A heavenly romance between Kathy Augustine and her fourth husband leads to hell, while her daughter becomes caught up in a deadly love triangle.

When Lance Cpl. Maria Lauterbach joins a new unit, she shakes up the marriage of a fellow Marine; a couple's marriage is perfect until long hours spent away from home leads to betrayal.

A musician undermines the happy marriage of a young Marine and his wife; a belly dancer must choose between her martial-arts husband and her doctor lover.

A couple's passion is red-hot until lies and betrayals tarnish their happiness; a military officer who relishes being a ladies' man becomes embroiled in a love triangle.

Tempers flare when Brandan Perry's girl turns her attention to a younger man; Sue and Joe Gogliotti have a comfortable life, until Sue goes astray.

A couple is doomed from the start; a couple has an ideal life until one begins to stray.

Lies about an affair cause Fred and Amber Dalton's marriage to become a battle. Military specialist Megan Touma breaks the rules with a fellow serviceman Edgar Patino.

A couple lives a quiet life, until the husband invites his wife's lover into their home; a young wife catches the eye of her boss.

A wife with a military husband plays while he's away; a couple's American dream turns into a nightmare.

A military career separates a couple, and each take lovers; a wife with musical talent begins an affair.

While most killers act alone, there's another type of murder that happens less frequently yet still produces horrific consequences. That's when people decide to kill as a group. This Investigation Discovery series details true-crime cases that involve victims who have been savagely murdered by their own friends. Stylized re-enactments featuring first-person accounts from law enforcement personnel and friends and family of the victims accompany each story.

Investigation Discovery honors the success of exposing double-dealing husbands and deceived wives in "Who the (Bleep) Did I Marry?" by reminding viewers to question the seemingly innocent people in their lives, from the dentist to the dry cleaner. The network's first true spinoff series, "Who the (Bleep)...," goes beyond stories of marriage misconduct to expose real evil lurking in relationships from all walks of life. Half-hour episodes include first-person accounts from those betrayed, among them Mary Capps, whose boss, Dennis Rader, was proven to be the infamous BTK serial killer, and Brent Jeffs, whose peaceful childhood turned hellish while living with his tyrannical, pro-polygamy uncle, Warren Jeffs. Re-enactments add to ID's signature methods of storytelling.

Dark dreams see the light of day in "Your Worst Nightmare," a typical Investigation Discovery true-crime series complete with jump-out-of-your-seat moments and chilling conclusions. Classic suspense film techniques highlight re-enactments of creepy, harrowing crimes, as victims' darkest dreams become unfathomable realities. Each hourlong episode features one story interlaced with commentary from law enforcement, criminal justice professionals, and psychologists, plus accounts from friends and family of the victim.

"Deadly Sins" presents true stories of everyday individuals who are pushed beyond the limits of the law by the seven deadly sins -- wrath, greed, sloth, pride, lust, envy and gluttony. Each episode navigates the twists and turns of two similarly sinful cases, piecing together their conclusions along the way with the aid of re-enactments and suspenseful storytelling. Guiding viewers through these deadly deeds is attorney Darren Kavinoky, a criminal behavior expert who provides professional insight and legal expertise in his analysis of each case.

From blushing brides turned cold-blooded killers to smitten grooms with shocking dark sides, "Fatal Vows" examines the criminal psychology behind deadly divorces. Guiding viewers through actual stories of love gone wrong are psychotherapist Stacy Kaiser and forensic/clinical psychologist Dr. Brian Russell, who examine each couple to better understand how the marriage turned from flawed to fatal. Stylized re-enactments are supported by interviews with family, friends, law enforcement, and potential victims of the crime, while Kaiser and Dr. Russell provide analysis on unions that break down until divorce and murder collide.

If someone told the women featured on "Wives With Knives" to cut the men out of their lives, the women took the advice literally. The series recounts real stories of women who stabbed their significant others, some of them fatally. The motivations for committing the crimes varied -- many of the attackers reached their breaking points after years of sexual, emotional and physical abuse, while jealousy and greed were primary factors for others. The series' host is criminologist, behavioral analyst and attorney Dr. Casey Jordan, who talks with the femme fatales on the series to add depth to the stories.

From the outside, families seem like harmonious units in loving homes. But you don't necessarily know what secrets families are hiding from the outside world. This series, narrated by actress Brenda Strong, explores families hiding the most extreme of family secrets: murder. Each episode explores a death in a family, unraveling the motives of the family members, all of whom are potential suspects -- and potential victims. Sibling rivalries, disputes over family businesses and infidelity are some of the factors that lead to the families' ultimate betrayals.

Chatter, innuendo and good ol' fashioned gossip are staples of Wendy Williams' nationally syndicated talk show, making it a perfect proving ground for her to host a crime series on Investigation Discovery. The daring diva of daytime loves a little dish now and then, but "Death by Gossip" offers cautionary tales to those who indulge in this guilty pleasure. The series uncovers actual crimes spurred by rumors and half-truths that lead to betrayal and even murder, showing that dishing the dirt can be a game without winners. So beware of offices, gyms, playgrounds and nosey neighborhoods -- the grapevine might strangle the most unsuspecting prattler.

If you're going to do the crime, you might as well do it with passion. "Scorned: Love Kills" is perfect Saturday night TV for those who prefer a voyeuristic peek into how lust and obsession can destroy lives. From dalliances with strip-club dancers to teachers falling for their students, the stories featured in this series mix sexual intrigue with bedroom betrayal to form a scandalous recipe for murder.

Aphrodite Jones' numerous true-crime books have captivated readers for years. Now, the best-selling author and criminal profiler brings her uncanny instincts to this series that focuses on the compelling cases that commanded the headlines. From the unsolved murder of child beauty-pageant contestant JonBenet Ramsey to the strange circumstances surrounding the deaths of singer Michael Jackson and model Anna Nicole Smith, Jones presents her expert take on the crimes, often accompanied with startling new footage, evidence and interviews.