Oklahoma County Sheriff Tommie Johnson III fired a deputy of nearly four years after the deputy was charged with felony stalking of his ex-girlfriend.

Dennis Tran Vu, who worked at the Oklahoma County Courthouse in downtown Oklahoma City, faces one count of felony stalking, and an arrest warrant with a $5,000 bond has been issued, KFOR reported on Wednesday, Sept. 16. As of Wednesday evening, Vu had not turned himself in to the Oklahoma County Detention Center, according to News 9.

Johnson announced the termination at a Wednesday press conference, saying the office first placed Vu on paid administrative leave after learning he had been served a victim's protective order (VPO) related to stalking. Once felony charges were filed, Johnson fired him.

"I can tell you that there's no place in law enforcement for any actions like this and how we conduct ourselves, in this agency," Johnson said at the press conference.

Allegations in court documents

According to KFOR's review of court documents, a woman who identified herself as Vu's ex-girlfriend filed for the protective order, alleging she was being harassed and physically followed.

The woman said she and Vu met on the dating app Hinge in November 2025 and dated for about a month starting in February 2026. She alleged that in June 2026, Vu appeared at the airport when she returned from an overseas trip. She said she had not shared her flight information with him.

In August 2026, the woman said she began receiving threatening text messages from an unknown number. Some of the messages referenced their relationship, according to KFOR.

She also alleged Vu appeared in the parking lot next to her workplace and later followed her in his Suburban along Lake Hefner Parkway.

The protective order asks that Vu stay at least 500 yards away from the woman, stop appearing at her workplace and surrender all firearms, News 9 reported.

Investigation and accountability

The Oklahoma City Police Department is handling the criminal investigation. Johnson told OKC Fox he could not share further details because of the active OKCPD investigation. He confirmed Vu did not have access to Flock surveillance camera data, though it remains unclear whether any other county equipment was used in the alleged stalking.

It is also unclear what specific action triggered the felony charge beyond the conduct described in the protective order filing. No public statement from Vu or an attorney representing him appears in available records as of publication.

Johnson said at the press conference that the office holds itself to the same standard it applies to the public. The detention center had expected Vu to surrender on Tuesday, Sept. 15, but he had not appeared as of Wednesday evening, according to News 9.

No court date or arraignment has been publicly announced. Anyone with information about the case can contact the Oklahoma City Police Department.