A murderer who is more than happy to speak about their crimes and does so without remorse will always be unnerving.
Police officers often end up being face to face with some of the biggest people in crime, and this includes some of the coldblooded murderers.
We’re not talking about people who kill someone accidentally or in self defence, but someone who planned and decided they wanted to end the life of another person.
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Whether it's an apparent lack of remorse over their actions, or some of the reasons why they decided to kill, killers hold a macabre fascination.
A video has continued to circulate online as it shows a police officer speaking to murderer Stephen McDaniel during an interrogation.
McDaniel was later imprisoned for the murder of 27-year-old Lauren Giddings and his behavior during the interview is really what concerned people.
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McDaniel killed Giddings on 26 June 2011 in Macon, Georgia. He used a master key to enter into her apartment. There he strangled her in her bedroom wearing gloves and a mask.
He then used a hacksaw to dismember Giddings' corpse, and concealed it in several locations, with her torso being concealed in a bin.
What has people freaked out was how seemingly impassive McDaniel appears over the course of a two hour interview.
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The video is sped up into a time lapse, and shows just how little McDaniel moves during the course of the interrogation. While the police officers performing the interrogation continually shift in their seats, leaning back and forward, McDaniel appears to barely move at all.
In fact, the most movement that the killer appears to do in the entire two-hour-long time lapse is to place his hands on the table, and to take them off again.
Other than that, the only movement is his head as it follows the officers around the room. The motion seems almost robotic.
Despite the disturbing display in the police interview, McDaniel was not always so unflappable when being confronted with the evidence of his crime.
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After the disappearance of Giddings, local news media got wind of the story and began interviewing Giddings' neighbors.
Among the neighbors who were interviewed was McDaniel.
In an extraordinary moment, the interview managed to capture the exact moment that McDaniel was told that a body had been found in the investigation.
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He becomes visibly shaken by the news, and even ends the interview, saying 'I need to sit down' as he walks off.
Initially, his reaction was explained as being the shock of losing a friend. However, just one day later he became a suspect in the case.
After confessing to the murder, he was sentenced to life in prison.