I've woken up to this news. It's all over FB. I am very saddened by this, more than I expected to be - I like some if the Deftones music but was never a huge fan, but Chi always came across as such a genuine, spiritual guy, all of which was expressed perfectly buy his bass playing. Their music was certainly taken to a higher plane by his soulful lines.
A unique player in the metal/rock scene, hugely talented and very humble, and someone I will always have the utmost respect for.
RIP