Yep it's a moulted exoskeleton - this is what a dead shrimp looks like:
It's the opaque white one next to the pebbles. Not sure if you can see it from this angle, but it's little black eyes were evident - you don't usually see black eyes in exoskeletons
aah thank you and sorry again for the loss mama i was worried as this is a day after adding then to my new tank and i never seen the exo include the legs and the long things that protrude from there head sorry the name has slipped my mind but mama that picture is good now i know what im looking for if one is missing
First time I seen one of those I thought one of mine had died too. Thankfully it is just the moulted exoskeleton. If you keep it in the tank you will see the other shrimp eat it to reassimilate the minerals, waste not want not and all that.