Talent Agency 81 made the announcement on Monday that Matsuki had passed back on October 27, 2015. Matsuki herself announced back in July that she was taking a hiatus due to health issues, namely accute pneumonia, in which she was receiving treatment for. The pneumonia started as a fever that refused to break in the beginning of the year and was diagnosed when she made a trip to the hospital.
Matsuki was best known for playing Ku-ko in Haiyore! Nyaruko-san, Isumi Saginomiya in Hayate the Combat Butler, Magical Sapphire in Fate/kaleid liner Prisma Illya, and Anna Nishikinomia in Shimoneta to Iu Gainen ga Sonzai Shinai Taikutsu na Sekai. She has also performed theme songs for a number of anime series including Haiyore! Nyaruko-san, Love Love?, and Zoku Sayonara Zetsubou-sensei.
We here at The Outer Haven extend our condolences, thoughts, and prayers to the Matsuki family during this difficult time.