It's bizarre to name anyone as a "nominal plaintiff" in such a case. As far as we can tell -- plaintiffs in wrongful death cases never bring in others as "nominal plaintiffs."
That said, Katherine's lawyer, Adam Streisand, tells TMZ, "Mrs. Jackson has no interest in Conrad Murray other than seeing that justice is done in the criminal courts."
Streisand adds, "She certainly would never tap Brian Oxman for the job of filing any kind of lawsuit for her or the kids."