Police failed to record an earlier stalking incident of another woman by the 27-year-old man arrested last week for attacking an idol singer with a knife in Tokyo.
Tomohiro Iwazaki was arrested Saturday for viciously stabbing Mayu Tomita, 20, during an event in Koganei, Tokyo, over her apparent refusal of a gift.
Tomita, who was stabbed more than 20 times, remains in critical condition and has yet to regain consciousness.