January 10, 2026 – San Bernardino County Sheriff’s Department officials report that they are providing an update regarding the criminal case 
involving the death of a 10-year-old child related to fentanyl exposure.
This investigation originated from an incident that occurred in December of 2024, in which a controlled substance, later confirmed to be fentanyl, was inadvertently accessed by the child, resulting in a fatal overdose.
Detectives from the Overdose Response Team determined Christina Alvarez possessed the fentanyl at the time of the incident. Alvarez was arrested and charged with felony child endangerment resulting in death, in violation of California Penal Code section 273a(a).
During previous court proceedings, the defense requested Alvarez be considered for mental health diversion under California law. Mental health diversion is a court-authorized process that allows eligible defendants with qualifying mental health disorders to receive treatment in lieu of traditional criminal prosecution when statutory criteria are met.
On January 9, 2026, after reviewing the request, supporting evaluations, and the circumstances of the case, the court denied mental health diversion. As a result, the criminal case will proceed through the traditional judicial process in accordance with California law.
The Sheriff’s Department recognizes the profound impact this case has had on the victim’s family and the community. Crimes involving fentanyl, particularly those that endanger children, remain a significant public safety concern. This investigation was conducted thoroughly and submitted to the District Attorney’s Office for review and prosecution.
The San Bernardino County Sheriff’s Department remains committed to aggressively investigating cases involving controlled substances and child endangerment and will continue working with prosecutorial and community partners to address the dangers posed by fentanyl.
DATE/TIME: March 18, 2025
INCIDENT: PC 273A(A) - Child Abuse Likely to Produce Great Bodily Harm or Death
LOCATION: 9000 block Arrow Route, Rancho Cucamonga, CA
SUSPECT(S): Christina Veronica Alvarez, 33-year-old resident of Rancho Cucamonga
VICTIM(S): Nathaniel Castro Mendoza, 10-year-old Resident of Rancho Cucamonga
Refer: Overdose Response Team
Station: Gangs/Narcotics Division
Phone No. (909) 387-8400
Case No. 652500068
Source: San Bernardino County Sheriff’s Department