As a sworn officer, isn't he shielded from lawsuits for what he does under color of authority?
If not, every surviving family member should individually sue him.
The courts may, or may not, say that this "man" who was hired explicitly to protect had no "duty to protect".
In which case, one could argue that every penny he took from Broward county was fraudulently obtained...
That is exactly what they will say. It is well established law.