It will be a most interesting investigation. Hazarding a Vessel would be the formal charge for the CO (commanding Officer), that coupled with the loss of life, does not bode well. The fact that the XO (Executive Officer) , and the CMC ( Command Master Chief) have also been relieved, means there were big leadership issues onboard. I've seen, and been on a ship that had a CO relieved for cause, but never have I seen the entire upper command relieved.
Hazarding a Vessel is a very serious charge and the loss of life compounds the severity. The Fitzgerald will most likely be ordered back to homeport, major elements of the crew reassigned, and then sent to refresher training before being able to deploy again.