20/20

A star cyclist is gunned down by a friend's jealous girlfriend, and the international chase to find the suspect.

A North Dakota student is abducted after shopping at the mall; inside the hunt to catch a killer before he kills again.

When a woman is found murdered, a written confession gives insight into the mind of her killer.

Gypsy-Rose Blanchard's story of murder, family, romance, deception and abuse; her first interview after her release from prison.

An attempted kidnapping leads police to a killer.

Conspiracy, escorts, and murder-for-hire. An exclusive inside look at the undercover investigation.

A U.S. Army Sergeant is murdered; investigators uncover a heartless plot of adultery and greed.

A mysterious brutal murder and the bizarre home renovation that may have been the motive.

A Florida university campus is on edge when a student disappears. Police say love, lies and obsession led to murder.

A mom who would stop at nothing to find her daughter after she vanished, and the team of investigators who solved the deadly mystery.

When four young women go missing, police hunt for a serial killer roaming the interstate. John Quiñones takes us into the families' quests for answers.

Ruby Franke, a popular YouTuber, sees her world implodes after her emaciated son escapes.

When a young couple is found dead, police learn they were involved in an online feud and uncover a deadly catfishing scheme.

A teen girl vanishes after getting into an unknown vehicle. When the truth of her disappearance comes to light, the community is shocked by who is behind the violent plot.

It seemed like life in the small town of Selmer, Tennessee, revolved around the well-known and beloved church pastor Matthew Winkler. Matthew, along with his wife Mary and their three daughters, were seen as a perfect family — until parishioners discovered their pastor's body in the family's home, and Mary and the daughters were nowhere to be found.

When Tricia Todd, a young mother who recently relocated to Hobe Sound, Florida, failed to pick up her 2-year-old daughter from the babysitter, her family was instantly worried. Police conducted an extensive search, questioning a pastor who twice met Tricia during her evening walks on the beach, a local ventriloquist whom she was infatuated with, and her ex-husband Steven Williams. But when those leads seemed to go nowhere, authorities were left wondering— who would want a young mother dead?

The last time anyone heard from Tracie Hawlett and J.B. Beasley, two teenagers on the verge of their senior year in high school, was on a sweltering July night in 1999. Tracie called her mother from a payphone to say they were on the way home from celebrating J.B.'s birthday — but the two never made it home. The girls' bodies were discovered in the trunk of J.B.'s car, less than a mile from the payphone, with gunshot wounds to their heads. Despite exhaustive efforts, including attempts to identify unknown male DNA found on one of the girls, the involvement of multiple agencies, national TV appeals, and even attempts at hypnosis of eyewitnesses, the case eventually went cold. In 2019, the use of genetic genealogy led to a breakthrough, resulting in a shocking arrest. Could they have finally found the killer?

In 2016, Fabio "Big Daddy" Sementilli was a beloved and sought-after hairstylist with a client roster that included Jennifer Lopez, Russell Crowe, Jackie Chan, Jennifer Love Hewitt and more. When Sementilli was discovered lying lifeless on his family's pool deck with multiple stab wounds to his neck and back, his family, friends and the hair-care industry were devastated. Initially, police suspected he had been a victim of a burglary gone wrong — until DNA found in his car led them to an unlikely suspect, who had attended Sementelli's memorial service sporting an injury.