Arizona-licensed doctor accused of using his own sperm to inseminate patients in Wisconsin

For Tucson and other Arizona residents, the central local fact in this case is that Dr. Frederick Dettmann holds an Arizona medical license, even though the allegations concern fertility treatment he is accused of providing in Wisconsin decades ago. Arizona Medical Board records show Dettmann has held a license in the state since 1997. The available profile contains little information, and board officials say he does not have a practice address on file. The records indicate his license is scheduled to expire next year. There is no indication in the available information that Dettmann practiced medicine in Arizona, but his continuing connection to the state has drawn attention because of the lawsuit filed in Milwaukee County Circuit Court.

The lawsuit was brought by Mary Ellen Lukezich and her son, Joseph Laedtke. It alleges that Dettmann used his own sperm to inseminate Lukezich without her knowledge or consent when she sought artificial insemination in Wisconsin during the early 1980s. The complaint describes an alleged deception by a physician who was trusted to oversee a reproductive procedure. The claims have not been proven in court. Dettmann’s attorney has said the doctor denies the allegations. Dettmann is also described as having retired in the 1990s after practicing as an obstetrician and gynecologist in the Milwaukee area for decades.

The alleged connection between Dettmann and Laedtke came to light roughly four decades after the treatment. Laedtke submitted a DNA sample to Ancestry.com and unexpectedly learned that he had multiple half-siblings. According to the account presented by the family, those people’s genetic results pointed to a common individual. The discovery led Laedtke and others to identify Dettmann as the person they believed connected them. The lawsuit now places that family history, and the circumstances surrounding the fertility treatment, before a Wisconsin court.

Laedtke has described the discovery as a profound personal shock. At a news conference in the Milwaukee area, he said that learning his identity was connected to alleged conduct by a doctor who had taken an oath to avoid harming patients was difficult to express in words. His statement reflects the family’s claim that the issue is not simply a question of biological parentage. They allege that the circumstances of his conception were concealed from his mother and from him, leaving the family to learn the information through consumer genetic testing many years later.

The case is part of a broader series of disputes involving fertility treatment and unexpected genetic relationships, although the available filings and reports focus on the allegations against Dettmann. One related case involved a family suing a Florida fertility clinic after discovering that their child was not genetically related as expected. Another involved women who settled lawsuits after a Yale fertility nurse allegedly substituted saline for a painkiller. Those cases are separate from the Wisconsin lawsuit, but they share concerns about patients relying on medical professionals during procedures involving reproduction, medication, and personal consent.

Dettmann’s Arizona connection appears to be limited, based on the information available, to his state license and a residence in Scottsdale. Investigators went to the Scottsdale home seeking a response to the lawsuit, but Dettmann did not answer the door. He and his attorney did not respond to additional questions about whether he had ever practiced in Arizona. Arizona board officials said there was no practice address listed for him. The online profile provides little additional detail about his work in the state, and the reporting does not identify an Arizona clinic, patient, or procedure connected to the allegations.

For people in Tucson, the case underscores what state licensing records can and cannot establish. A license record confirms that a physician is or was authorized to practice under Arizona’s regulatory system, but the records cited here do not show that Dettmann treated Arizona patients. The allegations themselves involve events in Wisconsin and date to the early 1980s, well before the license was issued in Arizona in 1997. Nothing in the available information says that Arizona regulators have accused him of misconduct in this state, or that the Wisconsin claims have resulted in a finding against him.

The lawsuit’s next steps will take place in Milwaukee County Circuit Court. The family’s allegations, the genetic discoveries that preceded the filing, and Dettmann’s denial are now part of a legal dispute that may determine what happened during Lukezich’s treatment. The Arizona Medical Board record remains relevant because Dettmann’s license is still listed in the state, but the available reporting does not describe any disciplinary action against him or explain whether the license is currently being reviewed. Until additional court or regulatory information becomes public, the claims should be understood as allegations, with Dettmann maintaining that he did not commit the conduct described in the lawsuit.