Serious Q, but what incentive would they have in killing him? Would that get them their money back? Wouldn't they lose more than they could gain?
In this case, I’d bet that he’s safe if he ends up in federal custody since being in prison is also effective punishment from this perspective. If not, it’s easy to imagine something happening to him if he tries to hide somewhere since the message “you can’t run far enough” will heard by everyone in that world.