Washington Man Sentenced to Prison for Assaulting His Partner with a Knife and Attempting to Suffocate Her

Spokane, Washington - United States District Judge Thomas O. Rice sentenced Marvin Samson Butterfly, age 40, to 70 months in federal prison on charges of Assault with a Dangerous Weapon in Indian Country, Assault of an Intimate Partner and Dating Partner by Suffocating and Attempting to Suffocate in Indian Country, and Attempted Witness Tampering (70 months on each count to be served concurrently). Butterfly was convicted of those crimes on April 9, 2024, following a jury trial. Judge Rice also imposed 3 years of federal supervision after Butterfly is released from prison.

According to court documents and information introduced at trial and sentencing, on September 16, 2023, officers with the Spokane Tribal Police Department were called to a home in Ford, Washington, for a reported domestic assault. The victim, who is an enrolled member of the Spokane Tribe told officers that Butterfly assaulted her. Butterfly was upset with the victim because she had let another woman shelter in her home during a spell of cold weather. Butterfly began shouting, took out a long knife, and stabbed the floors, doors, and furniture. Butterfly assaulted the victim by holding the knife against her throat. Butterfly then pushed the victim down on the couch, placed his hand over her mouth and attempted to suffocate her. After the victim was able to pry Butterfly's fingers off her face, Butterfly left the home in the victim's car. Officers found Butterfly the next morning asleep in the victim's car.

On November 2, 2023, while in jail, Butterfly placed a recorded telephone call to his neighbor. During the call, Butterfly made several statements indicating he did not want the victim to testify. Butterfly encouraged his neighbor to stress to the victim that he would be coming home - i.e., getting out of jail - so long as the victim did not cooperate with investigators.

"The victim in this case suffered terrifying acts of abuse and intimidation, stated Vanessa Waldref, United States Attorney for the Eastern District of Washington. "Domestic violence is one of the root causes underlying the MMIP crisis. My office is committed to working with our partners in Tribal and Federal law enforcement to secure justice for the victims and to build safer and stronger communities on Tribal lands and throughout Eastern Washington. I am grateful that the victim in his case was undeterred and that my office has built a strong support mechanism to protect the brave victims, that seek to end the abusive cycle of violence."

"Terrifying is the word that best describes the ordeal Mr. Butterfly inflicted upon the victim in this case." said Richard A. Collodi, Special Agent in Charge of the FBI's Seattle field office. "I'm thankful the victim was courageous and advocated for herself to help put Mr. Butterfly in custody where he belongs. Curbing violent crime on our state's reservations remains a priority for the FBI and our partners here in Washington."

This case was investigated by the Federal Bureau of Investigation and the Spokane Tribal Police Department. This case was prosecuted by Assistant United States Attorney Michael Ellis.