The Nebraska Supreme Court has officially upheld the manslaughter conviction and 10-to-14-year prison sentence for Mark Carlson, an Omaha doctor involved in a high-speed, fatal collision near the University of Nebraska at Omaha. The state’s highest court issued its ruling on Friday, rejecting arguments from the defense that the original trial court mishandled jury instructions concerning an alleged medical episode.
The deadly crash occurred on September 1, 2023, over Labor Day weekend. Prosecutors established during trial that Carlson was racing someone in his Mercedes down Dodge Street at speeds exceeding 100 miles per hour. He ultimately lost control of the automobile and smashed into oncoming traffic, striking a vehicle carrying 22-year-old Anna Bosma. Bosma, a South Dakota woman who had just graduated from college, died from the impact.
Appeal Over Jury Instructions and Medical Episode Defense
During his trial, Carlson’s defense team argued that the collision was the result of an unforeseen medical emergency involving spontaneous fainting rather than reckless behavior. Following his subsequent conviction by a jury and a March 2025 sentencing hearing where he received 10 to 14 years behind bars, Carlson appealed the verdict to the Nebraska Supreme Court.
The appeal centered on the district court’s refusal to provide specific jury instructions regarding the possibility of a sudden medical episode. Carlson maintained that jurors should have been explicitly directed to weigh whether an unavoidable health event caused him to lose control of the vehicle. However, the state Supreme Court backed the trial judge’s determination, noting that the existing instructions properly required the jury to find that the defendant committed the crime unintentionally while engaged in reckless driving.
The high court also reviewed challenges regarding statements made by prosecutors during closing arguments, including the assertion that unconsciousness does not automatically equate to a not-guilty verdict. Justices concluded that the prosecution’s remarks did not misstate the law or disregard the defendant’s mental state during the incident.
Accountability and Prior Proceedings
At his sentencing hearing in 2025, Carlson addressed the courtroom and accepted full responsibility for the tragedy, offering an apology directly to the victim’s family. I am sorry for the lateness of this apology, which comes 21 months after Anna’s passing. I would do anything to change the events of Sept. 1, 2023,
Carlson stated in court.
Under Nebraska law, a prison term of 10 to 14 years means an offender would likely be out in five years. Bosma’s family has previously expressed that the initial verdict and prison sentence brought a measure of justice following the legal proceedings.
With Friday’s ruling from the state Supreme Court, the legal challenges to the conviction have been resolved, leaving the original sentence intact.
