Christopher Daniel Duntsch is a former neurosurgeon who has been nicknamed Dr. D. and Dr. Death for gross malpractice resulting in the maiming of several patients and killing two of them while working at hospitals in the Dallas-Fort Worth Metroplex. Duntsch was accused of injuring 33 out of 38 patients in less than two years before his license was revoked by the Texas Medical Board. In 2017, he was convicted of maiming one of his patients and sentenced to life imprisonment. Henderson and Kirby feared that Duntsch could move elsewhere and still theoretically get a medical license. Convinced that he was a clear and present danger to the public, they urged the Dallas County district attorney's office to pursue criminal charges. The inquiry went nowhere until 2015, when the statute of limitations on any potential charges was due to run out. Part of the problem was being able to prove that Duntsch's actions were willful and intentional as defined by Texas law. After interviewing dozens of Duntsch's patients and their survivors, prosecutors concluded that Duntsch's actions were indeed criminal and that he must be imprisoned. Michelle Shugart, who led the prosecution of Duntsch, later recalled that Henderson, Kirby and Lazar reached out to her demanding to be allowed to testify against Duntsch, despite the fact that, according to Shugart, doctors almost never testify against each other. As part of their investigation, they obtained a December 2011 email in which Duntsch boasted that he was "...ready to leave the love and kindness and goodness and patience that I mix with everything else that I am and become a cold blooded killer."

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