According to this article, Johnson will be replacing Jason Lewis.
Apr. 19—The First Judicial District Attorney's Office has agreed to pay Albuquerque attorney Erlinda Johnson$125 per hour — up to $60,000 — to assist in prosecuting an involuntary manslaughter charge against Rust star and producer Alec Baldwin. The District Attorney's Office released Johnson's...
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Morrissey, who did not respond to questions Thursday, clarified Friday that Johnson essentially will replace Lewis on the case.
"Ms. Johnson has joined the team because Mr. Lewis has other professional responsibilities with another client for the next two months and cannot dedicate the appropriate amount of time to the case against Mr. Baldwin," Morrissey wrote in an email.
It seems like Morrissey is still calling the shots, but maybe only the DA's office can officially make the appointment?
Edit - I have to say that I'm more than a little suspicious of the claimed reason that Lewis is leaving.
What attorney would abandon such a high-profile gig, especially at this relatively late date? Perhaps there's some trouble in the relationship between Morrissey and Lewis?