This is never ok to ask, FYI. It's essentially asking someone to relive a likely traumatic experience to satisfy your curiosity. It's morbid and fails to take into account the human being behind the provider.
Sorry, I didn't realize things got that grim. I come from a completely different world and had no idea some experiences with clients were so traumatic. I was expecting stories about bad mishaps, like a client missing the toilet or something along those lines.