There are many different illnesses that can plague aquarium housed shrimp. Without sophisticated testing, and or intimate knowledge of the illnesses and diagnoses, it's impossible to determine the cause of death.
Shrimp that display milky white tissue are stressed. That stress can be from anything, such as; predator aggression (or the perception of aggressive predators), capture & handling, poor housing, over population, illness, etc...
Best practices for introducing anything new to an aquarium is to quarantine or sterilize, and TEST first. That includes rocks, wood, plants, tanks, used filter housings, tubes and animals. It is easy to make a seemingly harmless decision that can decimate a tanks population. I know someone who found a river rock that he liked, boiled it for 20 minutes or so, and then put it in his tank. Over the next week all of his shrimp died off. I helped him determine the problem by asking about any changes to the tank. I took the rock and put it in a bucket of R/O water and let it soak for a few days. I then tested the water and found that the rock was leaching nitrates into the water.