Joji Obara was served an arrest warrant Friday on suspicion of fatally assaulting British hostess Lucie Blackman in July and then dumping her body in a cave, police said.
Obara, 48, drugged Blackman, 21, around July 1 with the intent of raping her, causing her to die from an overdose, police alleged. He then dismembered her corpse and buried it in a seaside cave, they said.
Obara has already been indicted on charges of drugging and raping six women -- including an Australian who died -- and is on trial for some of the cases.
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