He did not do anything wrong.
If anyone felt guilty and wanted him to be dead, it wasn’t him. Suicide is for cowards. His statements to the WP are pretty good evidence that he was no coward shrinking from exposure. So what else was in the news the week of October 1? Any other dead bodies in the last month?
Taking $30,000 for a no-show jopb with a company that he would be doing business with in his new procurement position isn't wrong?
It is far more believable that he knew he'd be convicted of some crime and his wife would be devastaed financially. Maybe he cared more for his wife's financial future than his own life.