Former Boss Under Investigation, How To Address This

So, in my most previous job I ended up walking out because of my manager (not professional, I know, but things were REALLY bad). I found out a few months later she was under investigation and might possibly be facing murder charges for her conduct on the job. It was due to this conduct that I walked out, and it looks like it got even worse after I left. How do I address this with employers when they ask? For reference, I used to work in healthcare, and my boss was constantly overworking people/asking them to do things they weren't trained to do/ect. Big NO NO in the medical field.

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