Ventura County Man Sentenced to 51 Years to Life for Murder of Girlfriend in Simi Valley

Key Takeaways

• Ramon Joseph Rivas, 36, of Simi Valley was sentenced to 51 years to life for second-degree murder.
• He pleaded guilty and admitted to special allegations, including a prior strike offense.
• Jessica Marie Tinoco, the victim, was stabbed multiple times in her Simi Valley home on Sep. 27, 2024.
• Four of the stab wounds were determined to be fatal.
• Tinoco's five children witnessed the attack and fled the home safely.

Ramon Joseph Rivas, 36, of Simi Valley was sentenced to 51 years to life for the 2024 murder of his girlfriend, Jessica Marie Tinoco. The fatal stabbing happened in front of her five children at a Simi Valley residence.

A Deadly Domestic Dispute

On Sep. 27, 2024, officers responded to a stabbing call at a Simi Valley home. They found Rivas leaving the house shirtless, with his upper torso covered in blood, and took him into custody. Inside, Tinoco was lying just inside the front door with multiple stab wounds to her face, abdomen, and arms.

Prosecutors said Rivas grabbed a kitchen knife during a domestic dispute and attacked Tinoco. Her five children witnessed the assault and were able to flee the home. A bent steak knife with blood on it was found on the living room floor. Blood was also found throughout the residence.

Tinoco was taken to Los Robles Hospital, where she was pronounced dead. The Ventura County District Attorney's Office reported that four of her wounds were fatal.

Prosecutor's Response

Senior Deputy District Attorney John Barrick, who prosecuted the case, said: "The defendant's willingness to take responsibility for his horrendous crime doesn't excuse what he did to the victim and her family."

Sentencing and Legal History

Rivas previously pleaded guilty to second-degree murder and admitted to all special allegations and aggravating factors, including a prior strike offense dated May 20, 2026. The court sentenced him to 51 years to life, reflecting the severity of the crime and his criminal history.

Local California Context

The case was handled by the Ventura County District Attorney's Office and unfolded in Simi Valley, a city in Ventura County. The victim was transported to Los Robles Hospital in nearby Thousand Oaks. The attack in a family home, witnessed by children, has drawn attention to domestic violence risks in the region.

Background

Simi Valley has seen other high-profile domestic violence cases, but this sentencing marks a significant legal conclusion for a crime that shocked the community. Rivas's prior strike offense played a key role in the lengthy sentence.

This sentence ensures that Rivas will serve a substantial term for the murder of Jessica Marie Tinoco. For her family and the five children who survived, it closes a painful chapter while underscoring the consequences of domestic violence.

Sources and Materials

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