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[The Widow of Woodland Hills: A Dateline Mystery]-[The Widow of Woodland Hills]

Dateline NBC · B2 · 2025-04-15

True crime
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📋 Summary

The Tragic End of an Icon

Fabio Sementilli, a celebrated celebrity hairstylist known for his work with stars like Jennifer Lopez and Jackie Chan, was found brutally murdered in the backyard of his Woodland Hills, Los Angeles home on January 23, 2017. His 16-year-old daughter, Isabella, discovered him slumped over in his favorite chair, a scene that veteran LAPD detective Mitzi Roberts described as an "execution" rather than a botched burglary. Despite the ransacking of the master bedroom, the crime scene bore the hallmarks of a staged event, as valuable items like a Rolex watch remained untouched, while Fabio’s Porsche was stolen.

The Web of Deceit

As investigators delved into the life of Fabio’s widow, Monica Sementilli, they discovered a disturbing reality beneath the facade of a grieving spouse. While Monica publicly posted tributes to her "greatest love story" on Instagram, she was secretly involved in a torrid affair with Robert Baker, a registered sex offender and racquetball instructor whom she had met at their local gym. Friends and family grew suspicious when Baker appeared at Fabio’s memorial service, acting inappropriately intimate with Monica while wearing a bandage on his finger—a detail that would later prove crucial.

The Breakthrough: Science and Surveillance

LAPD’s Special Investigations Section (SIS) utilized high-level surveillance to monitor Monica and Baker. They observed the couple engaging in intimate behavior just weeks after the murder, effectively dismantling the image of a heartbroken widow. Forensic evidence provided the smoking gun: Baker’s DNA was found on bloodstains inside the stolen Porsche and on a vinegar bottle left at the crime scene, suggesting a desperate attempt to clean up.

The Mastermind Revealed

The case took a dramatic turn when Christopher Austin, a friend of Baker’s, was arrested. Austin confessed that Baker had recruited him to commit the murder, claiming Monica wanted Fabio "gone" to secure a $1.6 million life insurance payout and to continue her relationship with Baker without the social stigma of divorce. Prosecutors presented damning evidence that Monica had acted as a lookout, using a home security app on her phone to monitor the house while pretending to be shopping at Target during the time of the murder.

Justice Served

In 2023, Robert Baker pleaded no contest to the murder, and Christopher Austin turned state’s witness against Monica. Despite the defense's argument that Monica was a victim of Baker’s obsession and that her affair did not equate to murder, the jury was unconvinced. In January 2025, Monica Sementilli was found guilty of first-degree murder and conspiracy. The verdict brought closure to Fabio’s sisters and son, who had long fought to clear the name of the man who lived by the motto: "Chin up, charge the mountain."

🎯Key Sentences

1
I had no other option.
2
I had to do something.
3
Who am I gonna kill?
4
Shook us to the core.
5
How lucky am I to have lived the greatest love story of all time?
Expand All

📝Key Phrases

1
harness one's outrage into a mission
2
face extraordinary circumstances
3
wrap one's head around something
4
cover one's tracks
5
charge the mountain
Expand All

📖 Transcript

A true crime story never really ends.
Even when a case is closed, the journey for those left behind is just beginning.
Since our Dateline story aired, Tracy has harnessed her outrage into a mission.
I had no other option.
I had to do something.
Catch up with families, friends, and investigators on our bonus series after the verdict.

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