What I read was that he was an immensely successful financial adviser who was inspired by patriotism to join the Army. It said nothing about his being suspected of fraud. But perhaps this is a recent discovery. Clearly, he cannot be sued or convicted of fraud until the shooting spree case has been settled. If he is sentenced to life (most likely in my opinion) or executed, the fraud charge won't amount to much. You cannot collect from a penniless inmate.
Is there a connection from a fraudster and a murderous psychopath? I don't know. I can't see Bernie Madoff machine gunning women and children, but then again, this guy is not Bernie Madoff.