Piers Morgan has recalled the chilling moment he realised murderer Bernard Giles was the "most dangerous person" he'd ever encountered as he interviewed him for ITV's Confessions of a Serial Killer.
The Good Morning Britain host sat down with Giles, who murdered five women in a killing spree in the early 1970s, in Brevard County high security prison in Florida where he is serving life in prison for his heinous crimes.
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And a clip from the interview, set to air on Thursday 7th February, was aired on today's instalment of GMB in which Piers confronted the serial killer.
The clip taken from the documentary sees Piers holding up a picture of Giles' own daughter, asking him how he'd feel if she was murdered.
Chillingly unemotional, the convicted criminal replied: "I don't put those together. I certainly wouldn't appreciate it."
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A psychologist explained the scenes further. "I'm not excusing his crimes or mitigating them in any way. But understand his daughter was five months old when he last saw her, he hasn't had contact with his family for 45 years," she said.
"So you're operating with that question from the basis of love for your child and he doesn't have that love for his child because he doesn't remember her.
"He never had the opportunity to build love and empathy so he's flat-lined. It's very disturbing to us but [most] of his life he's spent incarcerated. He's desensitised and institutionalised."
Piers reflected over the disturbing moment with co-host Susanna Reid.
"It was a chilling couple of hours I spent with him. Rarely do things affect me but I just thought of those poor young women, and his calm admission that it could have been anyone's daughter or wife," the normally outspoken journalist recalled.
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Susanna shared her shock that the pair were just sitting across from one another with no glass screen.
She said: "I would have assumed that there was a glass screen in between you, the guy's a serial killer, he doesn't care if he takes a life or causes damage to someone in the same room as him.
"Is that not a concern that crosses your mind?"
Piers explained that there were actually very heavily armed guards surrounding them, which wasn't shown in the clip.
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"But they're probably not quite close enough to stop anything and sometimes they do give specific warnings to say, 'Look, if you are attacked, do not react, we will deal with it'," Piers added. "But they don't have anything to lose and he was probably the most dangerous person I've ever met in my life."
Confessions of a Serial Killer airs on ITV on Thursday at 9pm.
Topics: Good Morning Britain, TV Entertainment, GMB