Bay Area/ North SF Bay Area

Suspected Familial Homicide in Sonoma County: 71-Year-Old Man Arrested for Alleged Killing of 94-Year-Old Father-in-Law

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Published on August 17, 2025
Suspected Familial Homicide in Sonoma County: 71-Year-Old Man Arrested for Alleged Killing of 94-Year-Old Father-in-LawSource: Sonoma Sheriff

In a turn of events that shattered the peace of a River Road neighborhood, Sonoma County authorities have arrested 71-year-old Khanh Trong Tran on suspicion of the intentional killing of his 94-year-old father-in-law, Sy Van Nguyen. Initially believed to be a natural death when reported last Monday, August 11, evidence brought to light four days later suggested a far grimmer reality.

Despite the absence of visible trauma when Sonoma County Fire District and Sheriff’s Office personnel responded to the 5800 block of River Road, where they found Nguyen unresponsive and later pronounced him dead, it was not until last Friday that the case took a sharp turn. Revealed by a social media post from Sonoma Sheriff, patrol deputies were furnished with evidence that recast Nguyen's demise from a natural death to one of conceivable malice.

The investigation was quickly escalated to the Violent Crime Investigations team and CSI detectives, who moved to apprehend Tran after obtaining an arrest warrant. The suspect, who resided in a separate dwelling on the same River Road property as his father-in-law, eluded authorities initially and was not found at the time of the search warrant's execution.

However, detectives and patrol deputies remained undeterred. After an extensive search, Tran, found inside a vehicle, was taken into custody around 4:15 AM yesterday in the 1700 block of Marlow Road. Remaining steadfast in their duty to serve, the deputies located him, who was arrested on a murder charge, defined under Penal Code 187(a) PC, and is being held without bail.