I haven't heard anything else--my friend hasn't been online tonight. I don't think the toxic substance is known at this point--he poisoned himself with something, but that hasn't been figured out.
Chocolate is toxic to animals in moderate quantities (theobromine, the active ingredient in it, is a potent stimulant their bodies cannot metabolize out), but it is an "all or nothing" poison (like poison hemlock) and if it does not kill them, they have no lasting organ effects.