The lyrics of untitled ~for her~ seem to indicate that ANEKI aka Ayumi Ogata committed suicide.
Quote:
The endless road that leads over that cloud
And connects up to the sky
That day, you made the decision
To follow that road alone
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We don't really know for sure though.
As for the other friend that passed away, I think it was one of her male friends, BACCHI, that was part of the red-bracelet/RED LINE-ish group (Tsuriko, BACCHI, Ayu). Apparently Life was also dedicated to him in 2008. The lyrics for RED LINE ~for TA~ came from a blog entry that she wrote about BACCHI back in 2009.