Thanks for your comments and the link.
I hope so much that the family is very thoughtful when they make their comments at sentencing. A litany of the suffering that the family has experienced will have NO effect on someone like MM. However, if they talk about how all the people who previously admired him, people whom he admired, professional associates,etc. all now know that he is a liar, a diabolical manipulator, a sordid *advertiser censored* watcher & adulterer, and ultimately a clumsy & base killer without integrity. That will have a painful impact because he is only concerned with his perception of himself.
He is a narcissist and more. He doesn't care about the feelings and thoughts of Linda nor his children, but he does care about himself. If you want to damage him, make it clear that he is now fully revealed for the fraud and evil-doer that he is to the people whose opinion he valued.
If I were the one to make the statement, I would consult expert Pat Brown (criminal profiler, psychologist and over-all brilliant woman. Here is link to a contact:
http://womenincrimeink.blogspot.de.) I would endeavor to make a statement that would really stick w/ Marty. I would remind him it is no longer appropriate to call him "doctor" - despite his jailhouse nickname of Doc.
MM cares not one whit about the family's suffering. He cares only about himself and I would do all in my power to shatter what he believes his "image" is. If necessary, let Kim accomplish this. She seems pretty able to address painful emotional matters with calm and clarity.
Just my 2 cents.
PS I'd also clearly tell him that his "great love" Gypsy is now sharing & laughing about all of their most private conversations and plans with her new boyfriend - a former inmate. Also, tell him that she will soon complete her training and will be a full-fledged truck driver. I don't think that is the image he wants to have of her.