Perhaps the killer was a trusted confidante of Litvinenko. His last mistake.
If he wasn't a stranger, Litvinenko would have been able to put a name on this person. That he could not do. Supposedly, Lugovoy and Kovtun were to be in the room also.
> Perhaps the killer was a trusted confidante of Litvinenko. His last mistake.
Perhaps, Lugovoy or Kovtun.