Issei Sagawa, born in Japan, was a Literature student attending the Sorbonne in Paris.   While there, in 1981, he became obsessed with Renee (Renae) Hartevelt, a 25 year-old Dutch student.  After inviting her to his apartment he shot her in the back of the neck with a rifle -- killing her!  Sagawa, who had harbored cannibalistic fantasies since childhood, then turned his dreams into reality.  He had sex with Hartevelt's corpse, cut the body into pieces, and began eating it -- some raw and some cooked in a frying pan with seasoning.  He was later arrested after packing uneaten body parts into suitcases and trying to discard them at a park.   Sagawa confessed and was held for 2 years, before being committed to a hospital for the criminally insane.  While he was there he wrote his autobiography In The Fog, which became a Japanese best-seller.  French officials were persuaded not to prosecute Sagawa due to his mental state, and he was deported back to Japan in 1984.  Once back in his home country he was found to be sane, and by 1986 he was a free man.  While talking about Hartevelt he said:

“When I think back on how gentle Renee was, I ask myself why I did what I did, and there’s no end to my feelings of bitterness,” Sagawa reflects. “But I wanted to eat her. That doesn’t mean I wanted to kill her, but I came to the realization that in order to eat her, I had to kill her.  If I think about it now, if, instead of her flesh, I’d been able to obtain her pubic hairs or urine and put them in my mouth I might have been satisfied. But I wasn’t able to bring myself to ask—I guess I was afraid my asking her for it would have disgusted her.”

Issei Sagawa, the "Paris Cannibal," went on to write restaurant reviews, paint nudes, and eventually even went into porn.  He is currently in his 60's and living in a small apartment in Kawasaki City, Japan.

References:

http://mentalfloss.com/article/23690/6-horrifying-modern-cannibals 

http://www.japantoday.com/category/kuchikomi/view/paris-cannibal-sagawa-reminisces-over-his-grisly-crime

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