The young, homeless man slipped into his victim's house at the edge of the isolated Nouilhan hamlet yesterday, grabbed a metal object in the barn and smashed the old man's skull, a source close to the probe said.
According to his initial statements to investigators, the 26-year-old, who was responding "to messages or voices in his head", set fire to the body and then extracted his victim's heart and tongue to cook and eat them, added the source, who refused to be named but had seen the crime scene.
Police discovered the calcinated body of the victim with an open wound clearly visible on his side, and a bit of cooked meat on a plate with white beans taken from the old man's fridge.
The emergence of that detail will inevitably lead to comparisons between the case and Hannibal Lecter, the fictional cannibal in horror film "The Silence of the Lambs", who famously ate a victim's liver with "some fava beans and a nice Chianti".
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So far, investigators are basing themselves on what the suspect confessed, and it is unclear whether he cooked or ate all the body parts he ripped out.
By the time police arrived, the suspect had already left the house and assaulted another man on his tractor, breaking his shoulder.
He then entered another house and was chased out by barking dogs and the owner, but not before grabbing a shotgun.
Police finally caught him before midnight. He was "very calm, not aggressive," local prosecutor Chantal Firmigier-Michel told AFP.
"It would seem he acted because of voices, messages that he was receiving and that were telling him to act in this way. Those are his first statements," she said.