A Pennsylvania woman was found dead in her car in 2014 after getting into an argument with her boyfriend. The cause of her death is unknown.

We speak with experts about how conditions, like environment and temperature, affect forensic evidence when a body goes undiscovered for long periods of time.

The British-American anti-virus software pioneer was found hanging in his cell in a Spanish prison hours after a court ruled that he would need to return to the U.S. to face tax evasion charges. But his inner circle has doubts about the manner of his death.

When a North Carolina woman's body was discovered in a pool of blood at the foot of stairs in her home, her husband, Michael Peterson, became the prime suspect in her murder. But what really happened to her has been the subject of debate.

From teen victims Libby German and Abby Williams to Alonzo Brooks to the 'Jennings 8' and more, we look at some murder cases that investigators could use the public's help in solving.

The mysterious multiple disappearances of Hannah Upp have been a public fascination for years—but are we any closer to finding answers?

Although ruled accidental, Elisa Lam's mysterious death at the Cecil Hotel continues to fuel conspiracy theories and speculation.

Twenty-five years after her disappearance, what happened to Jodi Huisentruit, a 27-year-old morning news anchor in Mason City, Iowa, still remains a mystery. Read more about her sudden disappearance.

The Mystery Writers of America picks the best mystery stories of the year.