The best one I heard was that he had fallen out with Iraqi leaders & because he knew so much they decided to bump him off. IIRC it happened in Belgium (not Paris).

Bull was said to be a not nice type - a whore who would sell his organ (brain) to the highest bidder just as long as he he 'get it off' on his dreams.

He was also involved with super guns in Sth Africa.

What he was believed to have designed was a massive cannon that could put a sattelite into low orbit but it could also put a nuke in the same place. There were theories that the 1st firing would be a nuke into Israel.

The cannon was supposedly very long.

The segments for it were being built in UK etc: as agricultural piping.

UK intercepted some of them & this I think ended the plan.

Cheers

Doug