As it happens I don't think so, even though he very likely did kill himself. His best chance of using the information to get off would be formally cooperating with authorities in exchange for reduced charges and sentence, so he wouldn't want to disclose anything before this process. But that would require him to be able to provide enough evidence to convict people who the US authorities wanted to convict more than him. And if he couldn't use the information to get off I can't imagine people like him releasing it in some sort of final fuck you, more likely he knew he reached the end of the road and acted accordingly (much like Robert Maxwell)