He and another officer were attempting to search an inmate in the dayroom of the prison's Minimum-Support Facility. The inmate attacked Officer Gallegos and was then joined by 11 other inmates who continued to severely beat him and the other officer.
The inmates continued to assault him after responding officers intervened with physical force and pepper spray. All of the inmates were eventually subdued. Officer Gallegos was transported to a local hospital suffering from a broken nose, head injuries, and fractured vertebrae. He eventually released from the hospital to recover at home. He suffered a complication on September 14th, 2018, and suddenly collapsed. He was returned to the hospital where he passed away.
CDCR investigators recommended attempted homicide charges on seven of the inmates following the assault.
Officer Gallegos had served with the California Department of Corrections and Rehabilitation for 13 years.