A couple of reasons. One of them involves the mother being involved in an effort to change Florida law on what kinds of details are released in such cases. Now, granted, the REAL stuff she wants to change is the "reporting on the specifics on how her sons were killed" and not "who was she *******", but I think that her efforts have led the press to report FEWER facts on her case than they otherwise might have done.
The reality is that she had an extramarital affair that led the husband to do unconscionable things. And she is now married to O'Sullivan. We can speculate on what happened in-between, but those two data points are fairly well-known.
This shouldn't be rocket science.