The circumstances regarding Taiji were always sordid. I guess it was only expected for this to be how it happened, but it's still sad anyway. He left X Japan and then joined LOUDNESS, both of which if anyone outside the Jrock scene would have known, it would be these two bands as they were known for hair metal even here in the USA.
After the suspected suicide of hide (guitarist from X) and now this suicide of Taiji, it's sort of an underlying current of wondering if they're cursed or what...
Full story of his... er... adventures before death are
here.