Osage County Sheriff's Office Investation Division


Robert Testerman

Robert Testerman was raised in Newkirk, Oklahoma. Robert attended Northern Oklahoma College where he took courses in agriculture and business. He enlisted in the United States Army Reserve as a Military Policeman in 1998. Robert was called to active duty several times in the eight years he served. He was sent to El Salvador as part of Operation New Horizons, then Washington D.C. after the September 11 attacks where he served as law enforcement in Operation Noble Eagle. He was then deployed in combat operations in Baghdad Iraq as part of Operation Iraqi Freedom.

After leaving military service he began his law enforcement career at the Pawhuska Police Department in 2008. He then moved on to the Osage County Sheriff's Office in 2011. Robert served as a Patrol Division Deputy for over five years, primarily in the southern district of the county.

Robert was promoted to the Sheriff's Drugs and Violent Crimes Task Force in 2017. While with the task force he graduated the Criminal Investigation Academy 68, as well as graduating the Oklahoma Bureau of Narcotics and Dangerous Drugs Investigator course.

In November 2017 Robert was promoted to Sergeant and transferred to Patrol Division as shift supervisor. In September 2018 Robert was promoted to Investigation Division where he now serves. Robert has attended additional courses in investigation of crime to include Interviews and Interrogations, Essentials of Criminal Investigations, and Basic Crime Scene Response.


Rex Wikel

Deputy Rex Wikel was born and raised here in Osage County. Deputy Wikel's family has lived in Osage County, mainly in or around Pawhuska, for at least four generations. Deputy Wikel still lives in Osage County (Pawhuska) with my wife and son.

Deputy Wikel began his career in Law Enforcement in February 2008 in the Osage County Jail. In July of 2010, then Osage County Sheriff Ty Koch commissioned Deputy Wikel, as Deputy for the jail. In November of 2010, Deputy Wikel attended the basic CLEET academy in Ada, OK graduating on February 26, 2011. After graduating CLEET, Sheriff Koch promoted Deputy Wikel to a Field Deputy position. Deputy Wikel served the Osage County Sheriff's Office until 2014.

In October of 2014, Deputy Wikel accepted a position with the Pawhuska Police Department as Patrol Officer. During his time with the City of Pawhuska, Deputy Wikel performed the duties of Patrolman, Patrol Supervisor, and Interim Chief of Police. Deputy Wikel served with the City of Pawhuska until 2019.

In January 2020, Deputy Wikel accepted a Patrol Deputy position from Osage County Sheriff Eddie Virden. In January 2021, Deputy Wikel was promoted by Sheriff Virden to the Investigations Division, receiving the rank of Sergeant.

Deputy Wikel holds a Bachelor's Degree in Criminal Justice from the Central Christian College of Kansas. Deputy Wikel has an Advanced CLEET certification in the State of Oklahoma. Deputy Wikel has over 1000 hours of Law Enforcement Education.


anthony barrett

Anthony Barrett

Anthony Barrett brings over a decade of law enforcement experience that started with Tulsa County Sheriff's Office. Anthony worked in various jail operations prior to working as a deputy with Osage County Sheriff's Office.

Anthony not only brings this experience to the department but also education in criminal justice, CLEET training, and his advanced training and education in investigations, including but not limited to interview and interrogations.

Anthony has been long time Osage County resident. Anthony graduated from Charles Page High School in Sand Springs, Oklahoma prior to going to further his education in criminal justice. Anthony and his family live in Osage County and when not at work he enjoys spending time with his family.