Sexual sadists are addicted to the thrill of inflicting pain before killing their victims; an analysis contrasts the psyches of David Parker Ray, the Toy Box Killer, and Dennis Rader, the BTK Strangler.

1. Sexual Sadists

Factual

Documentary

They look the same as us, but they are not like us. They can be our colleagues, neighbours, and sometimes even our family members. You might have known them for years, but you would never have guessed what they are capable of.

Serial Psyche

Series 1

They look the same as us, but they are not like us.

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Big Zuu guides celebrity guests across a number of cities trying their local eateries.

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Some serial killers are driven by a hatred for humankind, while others seek revenge for their abusive childhoods; some simply love to kill; a look at a killer labeled America's most meticulous serial killer, Israel Keyes.

2. Cold and Calculating Killers

A shockingly common breed of serial killer: doctors and nurses who kill patients; serial killer and physician Dr. Harold Shipman murders more than 200 victims.

3. Angels of Death

Examining the most excessive serial killers who murder, often crossing over into horrible perversions like mutilation, necrophilia and cannibalism.

4. Extreme Killers

These are serial killers who work as a team; monsters who feed off each other's warped psyches to commit murders they never would have carried out on their own.