The unexpected death of Taiwanese actress Barbie Hsu has dealt a devastating blow to her husband, South Korean musician DJ Koo.

In a brief phone call with Korean daily Ilgan Sports, Koo, whose real name is Koo Jun-yup, reportedly struggled to contain the sadness in his voice, only managing to say: “I’m not OK.”

Hsu, who was 48, died in Japan on Feb 2 due to complications from influenza.

Her remains were transported back to Taiwan on Feb 5 following cremation in Japan. Taiwanese media spotted Koo in tears as he carried his wife’s urn into a car after arriving at Taipei Songshan Airport.