A lengthy investigation shouldn't be necessary, as any orders to move this guy would be in the Fed's data system. And there would be a paper order to accompany any move. We could not remove any inmate from the facility without being in possession of a copy of his original incarceration order, as it proved he was legally remanded to State custody. It, and the transfer order were the most important things to have in your possession when transporting inmates. And any internal moves also had to be documented, as it was imperative that an inmate's specific cell, unit, and bed number were accurately recorded, especially for counting purposes, which occurred throughout the day.
Yet, no one has bothered to check the paperwork. It makes better headlines to spin the story without any facts.
There is no "controlling authority" on keeping a prisoner in custody alive...