Bryan County Resident Pleads Guilty To Involuntary Manslaughter And Assault

MUSKOGEE, OKLAHOMA - The United States Attorney's Office for the Eastern District of Oklahoma announced that Marissa Laneau Dill, age 38, of Caddo, Oklahoma, entered a guilty plea to one count of Involuntary Manslaughter in Indian Country, punishable by up to eight years in prison and a $250,000 fine; one count of Involuntary Manslaughter of an Unborn Child in Indian Country, punishable by up to eight years in prison and a $250,000 fine; and two counts of Assault Resulting in Serious Bodily Injury in Indian Country, each punishable by up to ten years in prison and a $250,000 fine.

The Indictment alleged that on May 5, 2025, Dill unlawfully killed the victim in the commission of an unlawful act not amounting to a felony, that is failing to devote full time and attention to driving, contrary to Title 47, Oklahoma Statutes, Section 11-901b, and operating a motor vehicle under the influence of any intoxicating substance other than alcohol which may render such person incapable of safely driving or operating a motor vehicle, contrary to Title 47, Oklahoma Statutes, Section 11-902, and in the commission in an unlawful manner and without due caution and circumspection of a lawful act, that is, operating a motor vehicle left of the center line of the roadway, which might produce death.

The Indictment further alleged that on May 5, 2025, Dill unlawfully killed the victim's unborn child in the commission of an unlawful act not amounting to a felony, that is failing to devote full time and attention to driving, contrary to Title 47, Oklahoma Statutes, Section 11-901b, and operating a motor vehicle under the influence of any intoxicating substance other than alcohol which may render such person incapable of safely driving or operating a motor vehicle, contrary to Title 47, Oklahoma Statutes, Section 11-902, and in the commission in an unlawful manner and without due caution and circumspection of a lawful act, that is, operating a motor vehicle left of the center line of the roadway, which might produce death.

The Indictment also alleged that on May 5, 2025, Dill assaulted two other victims, resulting in serious bodily injuries to each.

The crimes occurred in Bryan County, within the boundaries of the Choctaw Nation Reservation, in the Eastern District of Oklahoma.

The charges arose from an investigation by the Federal Bureau of Investigation and the Oklahoma Highway Patrol.

The Honorable Jason A. Robertson, Magistrate Judge in the United States District Court for the Eastern District of Oklahoma, accepted the plea and ordered the completion of a presentence investigation report.

A U.S. District Court Judge will determine the sentence to be imposed after considering the U.S. Sentencing Guidelines and other statutory factors.

Dill is free on bond with conditions of release pending sentencing.

Assistant U.S. Attorney Edith A. Singer represented the United States.