Case is being treated as the result of foul play
TokyoReporter
Increased use of loss-prevention tags has been accompanied by a surge in stalking cases
Prosecutors said the decision was 'based on the content of relevant evidence'
Prosecutors had sought the death penalty for Jun Saito
Matsumoto said, 'I would like to sincerely apologize for the great trouble I have caused'
Suspects posed as waterworks inspectors in entering the shop
Keiko Kinoshita was found dead in her bathtub on January 30
Body had multiple stab wounds to the upper body, police said
Smartphone belonging to suspect contained more than 50 illicit images
Khat contains the psychotropic drug catine