A former Santa Clara County correctional deputy was arrested Monday night in an October 2013 assault on an inmate, sources told NBC Bay Area.
According to someone familiar with the case, the former deputy, identified as Timmy Tri, kicked a male inmate in the head and face resulting in injuries including lacerations to his face and a broken jaw.
Sources close to the investigation said Tri committed the assault while coming to the aid of a fellow officer who was trying to subdue the inmate.
The alleged assault was investigated in October 2013, and recommendations that charges be filed were sent to the District Attorney’s Office, according to sheriff's officials.
The DA's office took weeks to review the case and then decided not to charge Tri back then, officials said. During a sheriff's office internal investigation, Tri was put on administrative leave.
That leave lasted about 18 months before the complaint against Tri was resubmitted to the DA. It took another five months for the DA to pursue charges.
Tri was reportedly arrested at his East San Jose home. Efforts to reach him on Monday were unsuccessful.
Tri was a member of the department since 2009 but left in August 2015. Sources did not provide details of Tri's departure but said he was fired.
Santa Clara County Sheriff's Office spokesman James Jensen confirmed the arrest but declined to provide other details because it included personnel information.
NBC Bay Area's Bob Redell contributed to this report.