I stopped at a red light, and my truck puttered then died, won't turn over. Never had problem before, never sluggish, never lose power before either ,now battery level low on dash board showing.

First thing I would check for is a bad fuel pump. Turn key to on postion you should hear the fuel pump run for a couple of seconds even if you do not hear the pump come on it still can be the fuel pump have a fuel pump pressure test done.

I agree check your fuel pressure first if you have a gauge to hook into the line but it can also be your crank sensor could be bad and you may need to replace it