[bobkazamakis]

he's dead.

[IMSAI8080]

One point in favour of that theory is he has billions of dollars in bitcoin and has never attempted to spend any of it. Or maybe has lost the keys.

[xvedejas]

Two of the top candidates for Satoshi are known to have died as well: Hal Finney and Len Sassaman.

[startupdiscuss]

If he or she were dead, but their writing and code is extant, presumably they could still be identified.