The modern equivalent might be "I blog, therefore I am virtual." Virtual reality has displaced objective reality for millions of lonely souls (souls in the greater non-religious sense).
The virtual presence will long outlive the physical objective presence. There is no virtual death - just a long stasis of presence that is unchanging but still there to those who happen upon it.
Perhaps we need a type of virtual death (or for those who want to ape reality even more closely, virtual suicide or even virtual murder).
The virtual world is still in its infancy and the thought of death seems so far off.