I think its all changed again has it not? Its deffo radioactive thingy wotsits, found in him, his hotel and the fishy place he ate at.
Cath as much as it is sad, he lived the life of a real life James Bond in a way and knew he was under threat.
I think its wierd and agree with PB, if he was ordered to be killed there are quicker and less traceable ways of doing so. Whoever has done it WANTS media attention hence the method chosen.