Snipped and BBM: Yes, totally unprofessional in a court of law. You should always use Mr., Mrs. or Miss IMO.
BUT on the other hand, I think her attorney used her first name, instead of one of her many last names, because he may NOT have known what surname to use in court.
IIRC, the Idaho Warrant had the name "Lori Vallow" - and please correct me if I am wrong.
Then, it is found out that she is "married" to CD and using the name "Lori Daybell" … BUT … were Chad and Lori married legally in Hawaii (marriage license) or was it one of those ceremonies or whatever it is called ?
Just my two cents but I think her attorney called her Lori because he may not have known what her CURRENT LEGAL NAME was at the time of the hearing because the Warrant had one surname and Lori was using another surname.
Oh … and I am NOT defending her defense attorney … just saying when you get a client like Lori Vallow, or Lori Daybell, or Lori "Moroni," and claiming to be a "goddess"

it's probably best he stick to her first name.
I mean seriously, it would look bad if you are her attorney and had not done sufficient research to know what your client's current legal, real name was and/or is, and you used the wrong name in court. Stick to what you know, I guess.
All JMO and MOO !