Law enforcement authorities in Northern California have arrested four local men in connection with a violent late-night assault at Sonoma Plaza that led to the death of a 64-year-old resident. The arrests follow a multi-day investigation conducted by detectives into the fatal encounter that took place within the city’s central historic square.
According to statements released by local officials on Monday, the four individuals taken into custody were identified as Cristian Vargas Collado, Augustine Rossy, and Thomas Griego, who are all 20 years old, alongside 28-year-old Anthony Kirk. All four suspects are residents of Sonoma and were booked into the Sonoma County Main Adult Detention Facility on suspicion of murder as well as conspiracy to commit murder.
The incident that prompted the police response unfolded late on the evening of September 7. Patrol officers were dispatched to the prominent downtown plaza at approximately 10:30 p.m. after emergency dispatchers received reports regarding an injured person who was seen lying near the plaza’s landmark Italian Fountain.
Upon their arrival at the scene, responding officers discovered 64-year-old John Francis Avila, a resident of Sonoma, lying completely unconscious on the ground. Recognizing the extreme severity of the physical trauma he had sustained, emergency personnel immediately initiated lifesaving measures before arranging for rapid emergency transport to an advanced medical facility.
Avila was transported in critical condition to a regional trauma center, where medical staff worked to stabilize his condition. Despite days of intensive medical intervention, authorities confirmed that the victim succumbed to his severe injuries and was pronounced dead early Sunday morning.
Following Avila’s death, the investigation transitioned into a full-scale homicide probe. Detectives with the Sonoma Police Department mobilized extensive resources to identify those responsible for the fatal altercation, synthesizing physical findings from the scene with modern surveillance technology and statements from community members.
Investigators achieved a significant breakthrough in the case by analyzing data collected from automated license plate readers situated in the area. The automated license plate reader network allowed detectives to identify and track specific vehicles associated with the suspects entering and leaving the vicinity of the plaza around the estimated time of the attack.
In addition to the automated vehicular tracking data, investigators reviewed hours of security camera footage recorded across the perimeter of the plaza. This visual evidence, combined with physical evidence collected directly by forensic personnel from the area surrounding the fountain, allowed detectives to establish a clear timeline and identify the individuals involved.
Witness testimony also proved instrumental in moving the case forward. Individuals who were in or near the downtown plaza during the late-night hours of September 7 provided detectives with crucial eyewitness accounts, corroborating the digital and forensic findings gathered during the initial stages of the inquiry.
The legal proceedings surrounding the case have officially commenced in the local court system. Formal charges of murder and criminal conspiracy have been filed by prosecutors against two of the defendants, Thomas Griego and Anthony Kirk. Both men are scheduled to appear for their initial arraignment on Tuesday at 1:30 p.m. in Sonoma County Superior Court.
As of Monday evening, formal criminal charges had not yet been filed against the remaining two suspects, Cristian Vargas Collado and Augustine Rossy. Both men, however, remained in custody at the Sonoma County Main Adult Detention Facility as prosecutors and detectives continued their review of the case materials.
The deadly altercation occurred in the heart of Sonoma Plaza, an expansive eight-acre civic space that serves as the centerpiece of the community. The historic plaza houses prominent municipal and historical landmarks, including Sonoma City Hall and the preserved grounds of the Sonoma State Historic Park.
Beyond its civic importance, the plaza functions as a premier destination for both local residents and tourists, surrounded by numerous popular restaurants, retail shops, and commercial wine-tasting rooms. The occurrence of a fatal violent confrontation in such a central and heavily frequented public space has drawn significant community attention.
The Sonoma Police Department emphasized that the criminal investigation into the circumstances surrounding Avila's death remains active and ongoing. Investigators are continuing to examine the exact sequence of events and the specific roles each individual played during the altercation near the fountain.
Authorities are asking anyone who may have witnessed the incident or who possesses additional relevant information to assist investigators. Community members with pertinent details regarding the September 7 assault are urged to contact the Sonoma Police Department directly by calling 707-996-3601.
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