Emergency medical personnel and law enforcement officers responded on Friday, October 9, 2026, following an officer-involved shooting during an incident in southwest Sioux Falls. Minnehaha County Sheriff’s Deputy Katherine Ann Frank, 26, was critically wounded by gunfire while performing her official duties. First responders evaluated Deputy Frank at the scene before paramedics transported her to a regional hospital in critical condition. Despite intensive medical treatment over three days, Deputy Frank succumbed to her injuries on Monday, October 12. Deputy Frank had served with the Minnehaha County Sheriff’s Office since June 2024 following her prior service at the South Dakota State Penitentiary.
Emergency medical personnel and law enforcement officers responded on Friday, October 9, 2026, following an officer-involved shooting during an incident in southwest Sioux Falls. Minnehaha County Sheriff’s Deputy Katherine Ann Frank, 26, was critically wounded by gunfire while performing her official duties. First responders evaluated Deputy Frank at the scene before paramedics transported her to a regional hospital in critical condition. Despite intensive medical treatment over three days, Deputy Frank succumbed to her injuries on Monday, October 12. Deputy Frank had served with the Minnehaha County Sheriff’s Office since June 2024 following her prior service at the South Dakota State Penitentiary.
Law Enforcement Investigation and Criminal Charges
The South Dakota Division of Criminal Investigation (DCI), alongside state and regional law enforcement partners, secured the scene to process forensic evidence and reconstruct the incident. Law enforcement officials confirmed that 39-year-old Brandon Oetken was taken into custody in connection with the shooting. Oetken faces multiple charges, including three counts of attempted first-degree murder of a law enforcement officer and three counts of aggravated assault on a law enforcement officer, with prosecutors evaluating updated charges following Deputy Frank’s passing. The state criminal investigation into the shooting remains active.
Community Memorials and Family Tributes
News of Deputy Frank’s death at age 26 has brought widespread grief across South Dakota’s law enforcement community. Sheriff Mike Milstead honored her service, stating, “Deputy Frank served with dignity and heart. Her service made a meaningful difference, and her impact will remain with us always.” A public memorial has been established at the Law Enforcement Center at 320 W. 4th Street in Sioux Falls. She is survived by her parents, five siblings, grandparents, and boyfriend. Formal announcements regarding law enforcement honors, visitation hours, and funeral services will be released by the Minnehaha County Sheriff’s Office and family representatives once finalized.
