Some studies claim male sexual-homicide offenders over age 50 are rare—murders committed by them account for only 0.5 percent of sexual homicides in the U.S.—which may be due to steep declines in their testosterone levels. But could a decline in testosterone really put a halt to a killer's murderous spree?

Although the majority of murders are committed by someone the victim knows personally, killers are taking advantage of the popularity of social media to seek out strangers on Facebook, Craigslist, Tinder, Grindr and various dating sites.

Read an excerpt from Anne K. Howard's book, 'His Garden: Conversations with a Serial Killer' where William Devin Howell gives details about how he murdered and disposed of some of his victims.

In 1991, Miguel Angel Martinez,17, Manuel 'Milo' Flores,17, and Miguel Angel Venegas, Jr.,16, each played a role in a triple axe-and-knife murder that rocked the small city of Laredo, Texas. The motivation behind the crime remains a mystery. Martinez and Venegas tell their stories in 'I Am a Killer,' available on Netflix. 

Move over fingerprints—an exciting new field of forensics has emerged: DNA phenotyping, where investigators interpret DNA left behind at a crime scene to make predictions about what the perpetrator might look like. We spoke with Ellen Greytak, a bioinformatics expert, to learn more about the use and limitations of this new science.

Tricia Griffith, who runs the web forum Websleuths, talks to A&E True Crime about her close encounter with Ted Bundy, how the online community dug into the Casey Anthony case and why she believes police should let amateur detectives help investigations.

Dr. Thomas Andrew, retired chief medical examiner of New Hampshire and now a forensic consultant, speaks with A&E True Crime about a surprising autopsy case he worked on that aided a murder case.

A&E True Crime spoke with forensic podiatrist Dr. Michael Nirenberg to learn about the differences between footprints and fingerprints and why foot evidence can be so valuable to law enforcement.

Cheyenne Rose Antoine of Saskatoon, Canada made headlines in January 2018 for her Facebook selfie. But this was no ordinary photo: It was key murder evidence. We investigate social media's role in crime-solving and evidence-gathering.

On July 20, 2012, 12 people were killed and dozens more injured at a midnight showing of Batman: The Dark Knight Rises, when James Holmes opened fire in an Colorado theater. We spoke with forensic psychiatrist Dr. William H. Reid, who did extensive interviews with Holmes, about the mass shooter's mental state.