Chattanooga, TN – The Chattanooga Police Department announced the death of K9 Diesel, who passed away in the line of duty on September 17, 2025, following complications from injuries sustained during a SWAT security sweep earlier in the week.

Diesel, a German Shepherd, underwent emergency surgery on September 15, but doctors determined his injuries would result in a severely diminished quality of life. After consultations with veterinary specialists, the decision was made to humanely euthanize him.

“We are all aware of the inherent risk in policing, and that includes for our K9 partners too. Diesel faced those risks with loyalty and courage, always at the ready to protect our officers and safeguard our community,” said Assistant Chief Rusty Morrison. “K9 Diesel was a member of the CPD family, and his loss is felt by all of us, especially his handler and the entire K9 Unit.”

Diesel was born on August 28, 2022, and joined CPD in April 2024 after coming from Southern Coast K9 in New Smyrna Beach, Florida. He was a dual-purpose patrol and narcotics detection K9, assigned to Officer Paul Winkelman. His name carried special meaning, chosen in remembrance of the Fallen Five from July 16, 2015. It was recommended by the family of U.S. Marine Corps Sgt. Carson Holmquist, who was among those killed.

During his 17 months of service, Diesel earned several accomplishments. He placed second in narcotics detection at the 2025 USPCA Region 22 K9 Trials, which qualified him for nationals. He also assisted SWAT, Narcotics, and Gun Teams on numerous operations and carried out multiple successful apprehensions.

Though known for his skill and discipline, Diesel also had a playful side. Officers recalled his tendency to dunk his entire head into water bowls, splashing himself and anyone nearby.

The department expressed gratitude to those who supported Diesel in his final days. Among them were Erlanger LIFE FORCE and Tactical Paramedic Justin Krantz, who stabilized Diesel at the scene; Veterinary Care and Specialty Group in Chattanooga, which performed emergency surgery; and Dr. Blair Corman and the Animal Hospital of Signal Mountain, who provided ongoing care and end-of-life support.

Local businesses in Chattanooga and Signal Mountain offered space to help the department honor Diesel, while Girl Scout Troop 40837 created a Rainbow Bridge to mark his final journey.

Diesel will be remembered in the Fallen Heroes section of the city’s website in the coming days.