It's rare but it can happen. I don't think the male or female killing its mate is an issue as much as a female getting egg-bound, retaining an egg or slug and becoming septic, a male ending up with an infected hemipene, etc.
This is why you need to have access to a good herp vet / exotics specialist if you plan to breed, not just a small animal vet who knows just enough to push Baytril for an RI. Problems are rare, but when they crop up they're deadly.