Look for the split and the body
A molt is typically a thin, translucent shell with a split that allowed the shrimp to leave it. It may keep the outline of the animal and appear to have legs.
A deceased shrimp has an actual body rather than an empty casing. Check carefully from more than one angle, especially when the object is partly hidden by plants.
Avoid a rushed cleanup
Shrimp may pick at a shed shell, so it does not need to be removed automatically. If it is clear and not decomposing, leaving it briefly can avoid unnecessary disturbance.
If you need to remove it, use a small tool and avoid stirring the substrate. Make sure you are not grabbing a living shrimp resting near the shell.
Investigate patterns, not one shell
A single molt is part of growth. Several failed-looking molts or deaths deserve a water and equipment check rather than a quick conclusion based on appearance.
Record what you found and whether the colony’s behavior changed. Test relevant water values and review recent changes before adding supplements or medication.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.