81 Produce has sadly announced that one of the seiyuu they are managing, Tamaki Nakanishi, has now passed away. She was 44 years old.
According to the talent management agency, she died while on medical care last 14th March, though they did not specify the reason for her passing. Her family held a private funeral for the seiyuu.
Tamaki Nakanishi is best known for her roles in the Fafner series, She also voiced Neneko in Yumeria, as well as Nagatsuki Kuron in Happy Lesson: Advance.
May she rest in peace.
Source: 81 Produce