Authorities say the 35-year-old Dunn was under the influence of alcohol on Oct. 12 when he caused the death of Andrew Greywater.

A North Dakota man accused in a fatal drunk driving accident says he will plead guilty in federal court.

Louis Dunn, of Fort Totten, is charged with involuntary manslaughter and tampering with a witness.

Authorities say the 35-year-old Dunn was under the influence of alcohol on Oct. 12 when he caused the death of Andrew Greywater.

Dunn is also accused of trying to persuade a woman to influence the testimony of two witnesses in the case.

A plea hearing has not been scheduled.