Another way to sex them is if there's a dent in the claws its a male, a pronounce tooth on the bottom part of the claw is also a male, the pectines are also a way to tell. Also females are bigger than males, the one your holding seems to not be an adult, looks like a juvi female, if it died it would probably be because of a botched molt. I've have juvi emps die from it as well, it happens.