A crime psychologist warns about a common trap.

Dr. Julia Shaw will be on TV again with Killers: Caught on Camera.

The show has footage and analysis that helped catch killers.

The new series starts on April 21 and explores how violence happens.

Killers: Caught on Camera is a unique show.

Dr. Shaw spoke about the reality of murder and a common trap.

Dr. Shaw says everyone can commit murder, not just monsters.

There are steps that lead to violent acts, but anyone can do it.

We should think about what could make us do something bad.

Killers: Caught on Camera is back for Series 4.

We need to prepare for situations that could lead to violence.

Dr. Shaw says many people have the wrong idea about killers.

Killers often have problems with emotions and impulsivity, not personality traits.

Narcissism is not always the reason for violent behavior.

The show has footage and analysis by Dr. Julia Shaw.

There are many reasons people are unkind, not just because of psychopaths.

It's hard to get away with murder, and liars often get caught.

The show explores murders and the circumstances around them.

Dr. Shaw says we should work on our impulsivity to avoid trouble.

Not just psychopaths commit crimes, anyone can.

Killers: Caught on Camera returns on April 21 at 9pm.