Bodily fluids from dogs, cats and birds have helped solve several violent crimes in the U.S. and Canada.

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.

One of the young victims may have captured audio and photo clues that point toward the 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.

Read an excerpt from the book 'Life After Darkness: Finding Healing and Happiness After the Cleveland Kidnappings,' by Michelle Knight, now known as Lily Rose Lee.

Over the last century, dozens of highly publicized child kidnappings have shocked the nation and ignited a public effort to prevent them. Now, missing-child awareness campaigns help spread the word more widely and quickly, resulting in finding many more of these kids.

Podcaster Brooke Gittings of 'Convicted,' 'Actual Innocence,' 'Cold Case Files: The Podcast,' and more on the importance of using podcasts to showcase oppression.

Sgt. Ryan Wisniewski talks about how drones are used by—and against—law enforcement today.

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.

The Golden State Killer and the Zodiac Killer top the list.

Marcia Clark tells us why she was interested in investigating the mysterious death of Rebecca Zahau.

Here are the complicated details of the case.

As smart technology advances, so does the means for authorities to detect crime. We look at some cases of criminal clues in the Wi-Fi age.

Marcia Clark of 'Marcia Clark Investigates the First 48' tells A&E True Crime what swayed her in determining who was really at fault for Bonny Lee Bakley's death.

Journalist and therapist Nikki Meredith has corresponded with two of Charles Manson's most infamous followers for decades: convicted murderers Leslie Van Houten and Patricia Krenwinkel. Meredith speaks about what the former cult members are like today.

How the serial killer's youth led to adult crimes.

True-crime author Harold Schechter, author of 'Hell's Princess: The Mystery of Belle Gunness, Butcher of Men,' on what made serial killer Belle Gunness unique and if she tricked everyone into believing she died.

The famous prosecutor on the negative effect the media had on the investigation into what really happened to Chandra Levy.

In 1991, four teenage girls were brutally murdered in Texas.

A fashion icon’s murder capped Cunanan’s killing spree.