A Kiowa County jury on Thursday convicted 38-year-old Donald Streiff of first-degree manslaughter in the death of 32-year-old Corey Johns, who was found severely injured at a Mountain Park residence last May and later died at a hospital. The jury returned its verdict on March 25 and recommended a 10-year prison term with no credit for time served. Investigators said Streiff fled the scene before officers arrived, and he was arrested the next day. The case was investigated by the Oklahoma State Bureau of Investigation (OSBI) alongside local law enforcement.
SUSPECT FOUND GUILTY FOR FIRST-DEGREE MANSLAUGHTER #OSBI #OneTeamOneMission pic.twitter.com/tUIvTyZ2U1
— OSBI (@osbi) March 26, 2026
OSBI Confirms The Manslaughter Verdict
In a post on X, the Oklahoma State Bureau of Investigation confirmed that a Kiowa County jury had found Streiff guilty of first-degree manslaughter and recommended a 10-year sentence with no credit for time served. The March 26, 2026 update publicly acknowledged the jury’s decision and laid out who helped bring the case together, thanking the Mountain Park Police Department, the Kiowa County Sheriff’s Office, the District 3 district attorney’s office and the Office of the Chief Medical Examiner. The post also included a media contact for follow-up.
Investigators Detail How The Case Took Shape
According to reporting by KSWO, Mountain Park police called in OSBI after emergency personnel discovered 32-year-old Corey Johns severely injured at a home in the 600 block of North Main Street on May 13, 2025. Johns later died at a hospital. OSBI special agents, working with local officers, identified Streiff as a suspect. Authorities said he had already fled the scene before officers arrived. He was arrested and booked into the Kiowa County Jail on May 14, 2025. That initial coverage outlines the basic timeline investigators relied on throughout the case.
Sentencing Recommendation And What Comes Next
The jury’s recommendation of a 10-year sentence with no credit for time served is reflected in the OSBI’s public update. The agency did not list a firm sentencing date, and court records will show when Streiff is formally sentenced. The OSBI’s statement again provided a media contact, [email protected], for anyone seeking additional information and noted the involvement of local officials who assisted with the investigation.
