Masahiro Nakai, a former J-pop star turned TV host, said he was retiring following sexual harassment allegations and broadcaster Fuji TV announced a fresh probe into the matter, which has spooked advertisers.

Japan’s Fuji TV faced renewed criticism Friday after an activist investor demanded an independent inquiry into a scandal involving a celebrity TV host, which has sent its shares tumbling in recent weeks.

Top brass at Japanese network giant Fuji Television and its parent company have stepped down following explosive allegations involving former SMAP frontman Masahiro Nakai and claims of a corporate cover-up,