What is an "UAV"? Unmanned Aviation Vehicle?
I think that a UAV drone is the leading candidate, though we don't seeem to have dealt a quiet, perhaps non-transponder-using "recreational" VFR entirely off the plate. If it was a government-related drone, his family needs to be compensated. Perhaps there are some recovered, confiscated drug funds somewhere.
Controller errors may translate to radar anomalies and all that needs to be checked out thoroughly.
It could be a long time before one finds whatever he hit resting in some secluded 8-foot deep area of the bayou.
It could be interesting to note who goes a-lookin' for their missing goods.
HF