An 18-year-old Tahlequah resident faces up to 20 years in federal prison after pleading guilty to a violent assault within the Cherokee Nation Reservation.
Alejandro Dylan Rivera, who also uses the names Dylan Deerinwater and Dylan Deer-In-Water, entered the plea in the United States District Court for the Eastern District of Oklahoma, the U.S. Attorney’s Office for the Eastern District of Oklahoma reported.
The legal proceedings stem from an incident on July 10, 2026, in Cherokee County, where an indictment alleged Rivera assaulted a victim with the specific intent to commit murder.
Because the assault occurred within the boundaries of the Cherokee Nation Reservation, the case falls under the jurisdiction of federal authorities rather than local state courts alone.
The investigation into the July attack was a coordinated effort involving the Federal Bureau of Investigation, the Tahlequah Police Department, and the Cherokee Nation Marshal Service.
This multi-agency involvement highlights the complex intersection of tribal and federal law enforcement that governs criminal activity on Native American lands.
Magistrate Judge Jason A. Robertson accepted the guilty plea for one count of Assault with Intent to Commit Murder in Indian Country.
Under federal law, this specific charge carries a maximum penalty of 20 years in prison and a fine of up to $250,000.
Rivera will not be released while awaiting his final sentencing, as the U.S. Marshals Service has maintained him in custody.
A U.S. District Court Judge will eventually determine the exact length of his sentence, a decision that will be informed by the U.S. Sentencing Guidelines and various statutory factors.
Before the final sentence is handed down, the court has ordered the completion of a presentence investigation report to assist the judge in evaluating the case.
Assistant U.S. Attorneys Olivia Staubus and Kristin Knutson are representing the United States in the matter.
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