Watch clips of the various police dogs featured on Live PD working alongside their human partners.

Nicknamed 'The Dating Game Killer' after his 1978 appearance on the TV show of the same name while in the middle of a killing spree, Rodney Alcala died on July 24, 2021. Although convicted of seven murders, investigators speculate there are more victims.

A&E True Crime looks back on Columbian drug lord Pablo Escobar's rise to power and prosperity, and investigates who fired the bullet that took his life.

True-crime author Michael Arntfield talks about homicide detective Pat Postiglione, who headed up Nashville's cold-case Murder Squad and solved dozens of unsolved murders, and how the country-music mecca became a murder hub.

After the 2005 disappearance of Teresa Halbach, 16-year-old Brendan Dassey confessed to police that he and his uncle, Steven Avery, raped and murdered her. But Dassey later recanted his confession, suggesting that he'd been coerced into telling the police what they wanted to hear. The jury didn't buy it and sentenced him to life in prison.

Doctors who murder are a rare breed, but perhaps because their entire mission is to do no harm, they are among the most chilling kind of killers. Texas surgeon Dr. Christopher Duntsch is one such physician who violated his oath so profoundly by intentionally botching surgeries that he became known as 'Dr. Death.'

Researchers have found the vast majority of people who kill their families (familicide), are men with a history of violence toward their spouse and children. But what tips the scale from abuse to murder? And which men are most likely to kill? We spoke to a professor of forensic psychology for answers.

For Jeffrey Dahmer, it was watching certain movies. Dennis Rader, known as the BTK Killer, set the mood by pretending he was a spy. Ted Bundy liked drinking alcohol before some of his slayings. Not every serial killer has a signature routine, but some of them do engage in some sort of ritual or preparation before a killing.

On September 29, 1982, and in the few days that followed, seven people in the Chicago area died in Tylenol-related poisonings. The capsules were all laced with cyanide. The killer or killers have never been found.

Dr. Thomas Andrew, a medical examiner, says performing autopsies helped him understand the 'fragility of life.'