As someone who has handled federal contracts providing cctv equipment like the ones mentioned; the odds of those specific cameras “malfunctioning” at the specific time-whatever that is even supposed to mean- is essentially zero.
They are hardwired on a constantly updated and maintained basis. I’m talking millions of dollars a year. If the camera had gone offline, there would more than certainly be a visible and audible alert to the persons monitoring the feeds on premisis which all federal and state prisons are legally required to have.
Even if he “killed himself”, there’s no question there was someone intentionally forcing the hand.