From Rame.net:
Nozomi Momoi, involved in bizarre murder/suicide pact. 10/12 2002.
Yumika Hayashi, unknown. 6/29 2005.
from net:
Ai Iijima, od or heart attack.
Aya Maki Nida, suicides, fell from the balcony of her apartment.
Chiasa Aonuma, as I remember she died of illness, can not find...