Minnehaha County Sheriff’s Deputy Katherine Frank, 26, died Monday after being critically wounded during a shooting at a Sioux Falls, South Dakota, home. The confrontation also left a suspect wounded and resulted in multiple charges against him. Frank spent three days in critical condition before dying surrounded by family and loved ones. The sheriff’s office said she became an organ donor in her final act of service.
The shooting occurred Friday night, about 30 minutes after deputies arrived at the residence. The South Dakota Division of Criminal Investigation is handling the inquiry at the sheriff’s office’s request, while officials review the use of force during the encounter.
| 1) | Shooting at a Sioux Falls home |
| 2) | Deputy’s death and organ donation |
| 3) | Charges against the wounded suspect |
| 4) | Investigation and official response |
| 5) | Frank’s law enforcement career |
Shooting at a Sioux Falls home
Deputies responded to a home in Sioux Falls on Friday night. About 30 minutes after their arrival, gunfire erupted during a confrontation, critically wounding Frank and also injuring a suspect. Frank and the suspect were treated at the residence before being transported to hospitals.
The available account does not provide additional details about what prompted the confrontation, the sequence of shots, or the identities of other people who may have been present. Authorities have said the incident remains under investigation.
Deputy’s death and organ donation
Frank remained in critical condition for three days before dying Monday, October 12, 2026. She was surrounded by family and loved ones at the time of her death. Her death marked a significant loss for the Minnehaha County Sheriff’s Office and the wider law enforcement community in and around Sioux Falls.
“Deputy Frank’s death is a significant loss to our agency and to the broader law enforcement community in and around Sioux Falls. She served the citizens of Minnehaha County with professionalism, humility, and dedication. Her absence will be felt deeply by all who have had the privilege of working alongside her.”
The sheriff’s office said Frank became an organ donor, describing the decision as a final act of service that would allow her to help others after her death.
Charges against the wounded suspect
The suspect, 39-year-old Brandon John Oetken of Sioux Falls, was charged with three counts of attempted first-degree murder of a law enforcement officer and three counts of aggravated assault on a law enforcement officer. Jail records also listed a felony offense of disarming a law enforcement officer.
Brandon John Oetken remained in custody without bond Tuesday morning. It was not immediately clear whether prosecutors would file additional charges following Frank’s death. The available information does not establish the circumstances behind the alleged disarming offense or explain how the suspect was wounded.
Investigation and official response
The South Dakota Division of Criminal Investigation is conducting the shooting investigation at the request of the Minnehaha County Sheriff’s Office. Attorney General Marty Jackley previously said investigators would review the use of force during the encounter, with a public report expected within 30 days.
After Frank’s death, Marty Jackley said she had sacrificed everything in the line of duty and honored the service of law enforcement officers. The attorney general’s office said the shooting was the fifth involving law enforcement officers in South Dakota in 2026.
“We mourn the loss of Minnehaha County Sheriff’s Deputy Katherine Frank, who sacrificed everything in the line of duty to keep us safe. Let us never forget her courage and the service of all of our law enforcement officers. Deputy Frank and her family remain in our prayers.”
Frank’s law enforcement career
Katherine Frank began working at the South Dakota State Penitentiary in September 2022. She joined the Minnehaha County Sheriff’s Office in June 2024 and served as a deputy until she was fatally wounded.
Tributes, flowers and photographs were placed around Frank’s patrol vehicle in Sioux Falls after her death. The sheriff’s office said she served with dignity and heart, and that her work had made a meaningful difference to the community.
| Number | Key Point |
|---|---|
| 1 | Deputy Katherine Frank, 26, died three days after being shot in Sioux Falls. |
| 2 | Brandon John Oetken faces six serious law enforcement-related counts and remained held without bond. |
| 3 | The South Dakota Division of Criminal Investigation is reviewing the shooting. |
| 4 | Frank became an organ donor in what officials called her final act of service. |
Summary
The death of Deputy Katherine Frank has prompted mourning across the Minnehaha County law enforcement community and a continuing criminal and use-of-force investigation. The case against Brandon John Oetken could develop further as prosecutors assess the consequences of Frank’s death and investigators complete their review. Officials have emphasized Frank’s dedication to public safety and her decision to become an organ donor.
Frequently Asked Questions
Who was Katherine Frank?
Katherine Frank was a 26-year-old Minnehaha County sheriff’s deputy who joined the agency in June 2024 after working at the South Dakota State Penitentiary.
What happened during the shooting?
Gunfire erupted at a Sioux Falls home about 30 minutes after deputies arrived Friday night. Frank and a suspect were wounded and taken to hospitals.
Who is charged in the case?
Authorities charged 39-year-old Brandon John Oetken with three counts of attempted first-degree murder of a law enforcement officer, three counts of aggravated assault on a law enforcement officer and a felony offense involving the disarming of a law enforcement officer.
Who is investigating the shooting?
The South Dakota Division of Criminal Investigation is handling the shooting investigation, including a review of the use of force during the encounter.
