20/20

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

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

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

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

An attempted kidnapping leads police to a killer.

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

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

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

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

A former NFL player and his wife are murdered in Texas and the shocking evidence in their son's third murder trial.

The murder of a beloved mom sparks an international manhunt; police uncover clues in an accused killer's diary.

When multiple women are murdered in Texas, police hunt for a serial killer – but is he closer than they think?

Reporting on a verdict in the case of a beloved law professor's gruesome murder.

After a young couple is murdered, their true identities lead to a shocking twist about their missing baby.

A young woman's mysterious disappearance and the search-and-rescue operation that led police to a barn full of dark secrets.

When a woman vanishes, police uncover her husband's dark past; the missing woman's own past comes under scrutiny.

When a boy is kidnapped riding a bike, parents, police and a blogger work to bring him home.

When an inmate and corrections officer vanish, authorities question whether it's a kidnapping or a forbidden romance.

An illicit love triangle, a wife with a double life, and one big lie lead to murder.