Issei Sagawa:

Sagawa's wealthy father provided a lawyer for his defense, and after being held for two years awaiting trial Sagawa was found legally insane and unfit to stand trial by the French judge, Jean-Louis Bruguière, who ordered him held indefinitely in a mental institution. After a visit by the author Inuhiko Yomota, Sagawa's account of his kill was published in Japan under the title In the Fog. Sagawa's subsequent publicity and macabre celebrity likely contributed to the French authorities' decision to deport him to Japan, where he was immediately committed to Matsuzawa hospital. Examining psychologists there all declared him sane and found sexual perversion was his sole motivation for murder. Because charges in France had been dropped, the French court documents were sealed and were not released to Japanese authorities; consequently Sagawa could not legally be detained in Japan. He checked himself out of the hospital on August 12, 1986, and remained free.