Nature of Incident:
Unlawful Firearms Investigation
Report Number:
25-95567
Location:
Unincorporated area of Oxnard known as El Rio
Date & Time:
09/03/2025 @ 0700
Unit(s) Responsible:
West County Special Enforcement Unit, Headquarters Patrol, Headquarters Investigations
(S)uspects, (V)ictims, (P)arty, (D)ecedent
City of ResidenceAge
(S) Johnson, Jacob
El Rio
23
(S) Muniz, Isidoro Fonseca
El Rio
49
Narrative:
During the month of August 2025, deputies assigned to the Ventura County Sheriff’s Office Headquarters Station initiated a firearms investigation after responding to a call for service in the unincorporated area of Oxnard, known as El Rio, regarding a potential domestic violence incident. During the investigation, deputies assigned to the Headquarters Station partnered with detectives assigned to the West County Special Enforcement Unit.
Over the course of the next several weeks, detectives from the West County Special Enforcement Unit assumed the investigation and obtained a search warrant for a residence located in the 2900 block of Alvarado Street. On September 3rd, 2025, detectives served the search warrant at the residence. During the service of the search warrant, detectives detained a resident, later identified as Jacob Johnson, as part of the firearms investigation. During a search of the residence pursuant to the search warrant, detectives located two unregistered semi-automatic handguns along with various types of ammunition. Detectives arrested Johnson and another resident of the location, identified as Isidoro Fonseca Muniz, each for a violation of 27545 PC – Unlawful transfer of a firearm. Both Johnson and Muniz were booked at the Pre-Trial Detention Facility in Ventura, CA.
The Ventura County Sheriff’s Office would like to thank the members of the public for their ongoing support and diligence in providing information that assists our agency in solving crimes. We are better at what we do because of our community partnerships.
The Ventura County Sheriff’s Office would like to thank the members of the public for their ongoing support and diligence in providing information that assists our agency in solving crimes. We are better at what we do because of our community partnerships. Join us in the fight against crime by following us on “X” @VENTURASHERIFF, Facebook, Instagram @VCSHERIFF and @VCSOHQSTATION, and with Nixle by texting your zip code to 888777 to receive local law enforcement and public safety alerts and advisories.
Prepared by:
Detective Brian Dent #4451
News Release Date:
9/4/2025
Media Follow-Up Contact:
Detective Angel Guerrero #5533
805-654-2856
Approved by:
Booking Photo Release:
Captain Rob Davidson
YES NO
Ventura County Crime Stoppers will pay up to $1,000 reward for information, which leads to the arrest and criminal complaint against the person(s) responsible for this crime. The caller may remain anonymous. The call is not recorded. Call Crime Stoppers at 800-222-TIPS (8477).
