Christopher H. Derrick Dies After Fatal Officer-Involved Shooting in Pasco, Washington

A 47-year-old Pasco resident died after a Richland police detective shot him during a pre-dawn traffic stop connected to a federal investigation. The fatal encounter on October 21, 2026, is being investigated independently by the Tri-Cities Special Investigations Unit.

Fatal Shooting During Warrant Operation

Christopher H. Derrick, 47, of Pasco, Washington, died after being shot by a Richland Police Department detective during a multi-agency law enforcement operation near the intersection of Argent Road and Road 103 in Pasco.

According to reports citing the Richland Police Department, the operation took place shortly before 6 a.m. on Wednesday, October 21, 2026. Officers and detectives assigned to the department’s Southeast Regional Internet Crimes Against Children Task Force (SER-ICAC), Street Crimes Unit, K-9 Unit, and Criminal Investigations Division were involved in the operation.

The traffic stop was connected to the execution of arrest and search warrants related to federal charges involving the alleged receipt and possession of child sexual abuse material.

Authorities said Derrick was the sole occupant of the vehicle. During the encounter, he reportedly produced a weapon from inside the vehicle, prompting a Richland police detective to fire a duty weapon and strike him.

The specific type of weapon involved and the complete sequence of events leading to the shooting had not been fully detailed in the initial public reports.

Emergency Response and Death

Emergency medical personnel provided life-saving assistance following the shooting. Derrick was transported to Kadlec Regional Medical Center in Richland, where he died from his injuries.

The incident prompted a police response in the area around Argent Road and Road 103. Authorities began investigating the circumstances surrounding the shooting, including the events immediately before and during the traffic stop.

No publicly confirmed information in the initial reports established that any officers were injured.

Detective Identified as Independent Investigation Begins

The Richland Police Department identified the detective who fired the weapon as Ukiah Petersen, a member of the department’s Street Crimes Unit. Petersen was placed on administrative leave following the incident, in accordance with department procedures.

The Tri-Cities Special Investigations Unit assumed responsibility for the independent investigation into the officer-involved shooting. The investigation is intended to establish the circumstances surrounding the encounter and examine the use of deadly force.

The administrative leave does not, by itself, establish wrongdoing. The independent investigation remains separate from the federal criminal case that led to the warrant operation.

Authorities have not yet publicly released a final determination concerning the shooting.

Federal Charges and Separate Investigation

The traffic stop was connected to a federal investigation involving allegations of receiving and possessing child sexual abuse material. News reports stated that federal court documents unsealed on October 21 identified Derrick as having been indicted on related charges.

An indictment contains allegations, not proof of guilt. Because Derrick died before the federal case could proceed to a final determination, the allegations should not be presented as convictions.

The federal investigation and the independent inquiry into the fatal shooting concern separate matters. Investigators examining the shooting must establish what happened during the encounter, while the federal case concerned the allegations that prompted the warrant service.

Autopsy and Pending Findings

The Spokane County Coroner’s Office performed an autopsy on October 22, according to local reporting. The examination was intended to establish formal forensic findings concerning Derrick’s death.

The final autopsy findings and the completed results of the independent shooting investigation were not available in the initial reports reviewed for this article.

Additional information may be released as investigators determine what can be made public without compromising their work.

Personal Details

Incident Details

Community and Public Safety Impact

The fatal encounter has drawn attention to law enforcement operations in the Tri-Cities area and the procedures used to investigate shootings involving police officers.

Independent investigations are important in establishing a documented account of such incidents. The findings may clarify the sequence of events, the circumstances surrounding the use of force, and whether further action is warranted.

Until investigators release additional findings, conclusions about the justification for the shooting or the conduct of those involved would be premature.

Disclaimer

This report is based on initial local news coverage and information attributed to law enforcement as of October 23, 2026. Details may change as the independent investigation and related proceedings develop. The federal charges referenced in this report are allegations and should not be treated as proof of guilt. The circumstances and legal findings surrounding the officer-involved shooting have not been finally determined in the reports reviewed. Funeral arrangements and additional personal information were not available at the time of writing.