We list the surprising and previously unheard information related to Casey Anthony and the murder of Caylee Anthony from 'Casey Anthony's Parents Speak,' in which Cindy and George Anthony speak to Elizabeth Vargas for their first joint interview in years.

Some criminals get their crimes tattooed on their bodies, write 'fictional' books detailing murders they've committed or turn their own wanted posters into profile pics on Facebook.  We talk to an expert to better understand why some criminals implicate themselves in their crimes by communicating about them.

In recent years, hair, blood, saliva, and other bodily fluids from dogs, cats and birds have helped solve several violent crimes in the U.S. and Canada. A&E True Crime profiles four instances where animal evidence helped convict a criminal.

Read an exclusive excerpt from the new book 'Little Shoes: The Sensational Depression-Era Murders That Became My Family's Secret,' by Pamela Everett, about the murder of her two young aunts and whether authorities punished the wrong man for the crime.

The murders of Libby German, 14, and Abby Williams, 13, shocked the small town of Delphi, Indiana because of their apparent randomness. But what makes this murder case different than most is that it is believed one of the victims may have captured audio and photo clues that point to her killer.

Dr. Mike Aamodt, forensic psychology professor at Radford University, on why female serial killers have declined over the years, why there was a big jump in serial killings in the U.S. between the 1960s and 1980s and his most surprising finding in his research of serial killers.

From Green River Killer, Gary Leon Ridgway to Ted Bundy to Harold Shipman and more, experts on serial killers tell A&E True Crime who was the 'worst' serial killer and why.

Marcia Clark of 'Marcia Clark Investigates the First 48' tells A&E True Crime why she was interested in investigating the mysterious death of Rebecca Zahau on the show.

Convicted murderer Adnan Syed, subject of the wildly popular podcast Serial, has been granted a new trial. Here are details on what led to Syed's controversial conviction and what we know about the upcoming trial.

As smart technology advances, so does the means for authorities to detect crime. A&E True Crime looks at some of the more memorable cases of criminal clues in the Wi-Fi age.