14-Year-Old Marcia Shirree Thomas Identified as Young Girl Found Murdered and Burned in Southern California in 2009



In a heart-wrenching yet triumphant development, the Irvine Police Department has finally revealed the identity of a young girl whose life was tragically cut short in 2009. 

With the help of groundbreaking DNA technology, authorities have confirmed that the victim is 14-year-old Marcia Shirree Thomas from Reno, Nevada.

This somber discovery concludes a decade-long search for justice, a journey marked by unanswered questions and a persistent hope for closure. 

The case, which was once a mystery, has slowly come to light.

It reveals a troubling story of violence and the hard work authorities have put in to bring the offenders to justice.


A Chilling Discovery and Unsolved Mystery

On September 4, 2009, a shocking scene was found in Irvine. 

The burned body of an unidentified young woman was discovered in the parking lot of a closed business.

The circumstances surrounding her death were immediately deemed suspicious, and the Irvine Police Department launched a comprehensive investigation.

Despite thorough efforts, such as forensic analysis and public appeals, the victim's identity remained unknown. 

This left her family and loved ones in a painful state of uncertainty.

As years went by without any progress, the case went cold, but the investigators' determination never faded.


A Breakthrough in the Case

A turning point arrived in 2010 when two brothers, Gabino and Zenaido Valdivia-Guzman, were arrested and charged with the murder. 

Evidence connected Zenaido to the crime through a previous domestic violence conviction, giving investigators an important clue.

The case made a major advancement in November 2022 when Zenaido Valdivia-Guzman was convicted of first-degree murder with special circumstances involving kidnapping.

His brother, Gabino Valdivia-Guzman, is awaiting trial.


How Marcia Shirree Thomas was killed

Police say that on September 4, 2009, the two brothers, Zenaido Valdivia-Guzman and Gabino Valdivia-Guzman, tricked the young girl into getting into their van in Santa Ana.

Zenaido was 23 at the time and his older brother, Gabino, was 30. 

Gabino was driving the van while Zenaido was hiding in the backseat. 

When Thomas got into the van and saw Zenaido in the back, she started to panic, according to police.

The girl started screaming and trying to escape, but Zenaido dragged her into the back area and began hitting her in the face and neck, according to authorities.

While Zenaido attacked the girl, the older brother kept driving. 

As she continued to struggle, Zenaido eventually strangled her to death, according to police.

Gabino then drove the van to a business complex on the 1800 block of Kettering Street in Irvine. 

There, the brothers left the girl’s body in the parking lot, poured gasoline over it, and set it on fire, according to detectives. 

The brothers then stole the girl’s cell phone and escaped. 

The next morning, employees arriving at the complex for work found her body. 


A Family's Enduring Grief and Hope

“The Irvine Police Department has been committed to this case since 2009,” said Police Chief Michael Kent. “Marcia’s family remains in our thoughts during this difficult time. We appreciate the agencies that have assisted in providing crucial information to support the case and the family.”

The identification of Marcia Shirree Thomas as the victim is a bittersweet moment for her family, who have endured unimaginable pain and sorrow. 

While the discovery brings a sense of closure, it also reopens wounds and highlights the tragic loss of a young life.

The Irvine Police Department has extended their deepest sympathies to Marcia’s family and pledged continued support during this difficult time. 

Chief Michael Kent highlighted the department’s steadfast dedication to solving the case and holding those responsible accountable.


The community of Irvine has rallied around the case, offering support and encouragement to the victim’s family and the law enforcement agencies involved. 

The identification of Marcia Shirree Thomas has reignited public interest and renewed calls for justice.

As the investigation moves forward, authorities are urging anyone with information about the case to come forward. 

Detective John Sanders can be reached at (949) 724-7233. 

For inquiries related to the ongoing criminal case, contact Kimberly Edds, Director of Public Affairs for the Orange County District Attorney's Office, at (714) 347-8405.

As the legal process progresses, the community will keep watching with hope and anticipation, seeking closure for a young life that was tragically cut short.


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