'She's a liar, she's a manipulator, she's a cheater': Wife of murdered famed hair guru 'Big Daddy' partied with her lover in Las Vegas 'after getting him to kill her partner for his $1.6million insurance policy'

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A woman accused of murdering her famed hair stylist husband has been painted in secret grand jury proceedings as a sex-crazed, manipulative cheater who was spotted partying in Las Vegas with her lover shortly after his death.

Monica Sementilli, 45, and her boyfriend Robert Baker, 55, have been indicted by a jury for allegedly killing her husband Fabio 'Big Daddy' Sementilli last year.

The internationally known hairdresser was found stabbed to death on the patio of the couple's home in Los Angeles back in January 2017.

Prosecutors have alleged that Sementilli plotted to kill her husband to claim her share of his $1.6million insurance policy.  

Monica Sementilli and her husband Fabio 'Big Daddy' Sementilli were married for 20 years before she was accused of orchestrating his murder in Los Angeles last year

The couple, who had previously lived in Toronto before relocating to Los Angeles, had been married 20 years. 

Sementilli's defense team have been pushing to have parts of the damning testimony heard before the grand jury sealed because they claim it is prejudicial to her case.

Her lawyers were unsuccessful last month in their attempts to have transcripts of grand jury proceedings sealed.

Prosecutors had told the grand jury that Sementilli was the opposite of a grieving widow in the aftermath of her husband's death, according to the transcript obtained by LA legal blog, Trials & Tribulations. 

'She's a liar, she's a manipulator, she's a cheater and everything that comes out of her mouth has to be taken with a large grain of salt... Large enough so that you could choke on it,' the prosecution said.

Prosecutors have alleged that Sementilli was the opposite of a grieving widow in the aftermath of her husband's death. She is pictured above attending Fabio's wake with her lover and co-accused Robert Baker 

Monica Sementilli, 45, and her boyfriend Robert Baker, 55, have been indicted by a jury for allegedly killing her husband Fabio 'Big Daddy' Sementilli last year

The internationally known hairdresser was found stabbed to death on the patio of the couple's gated home in Los Angeles back in January 2017

Sementilli, who was arrested with Baker five months after her husband's death, was spotted partying in Las Vegas soon after the body was found, the court heard.

The jury was shown photos of Sementilli dancing, celebrating and taking selfies at Baker's Vegas birthday bash. 

Fabio worked for decades as a trendsetting hair stylist known as 'Big Daddy' and served as vice president of education for beauty products giant Coty Inc

Prosecutors described Sementilli as an 'Academy Award-winning actress' because she posted a Facebook status saying how much she missed her husband and then a day later allegedly kissed her lover in a bar.

That same day in the bar, prosecutors said Sementilli was caught on surveillance going out for a cigarette where she proceeded to grab the bouncer's thigh and then make out with him. 

'This p****s off Baker... because of course, he's gotten rid of the husband and this is how she repays him, right in front of his face,' prosecutors told the jury. 

According to testimony given before the grand jury, Baker had allegedly told friends that Sementilli was demanding in bed and that she had a preference for anal sex. 

Prosecutors also argued that Sementilli was eager to get her hands on her husband's $1.6million insurance policy and had called detectives several times to inquire about the money.

The couple, who had previously lived in Toronto before relocating to Los Angeles, had been married 20 years

She is alleged to have told detectives that she would be forced to sell the house and fire her housekeeper and pool cleaner if she didn't get the money.

Sementilli's defense attorneys have argued that parts of the testimony, particularly the sexual elements, are not relevant to her murder charge and could jeopardize a fair trial.

Investigators believe Sementilli had been having an affair with Baker for about 18 months before her husband was killed.

Detectives suspect that Sementilli orchestrated the plot to have her husband killed and Baker carried out the slaying.

Fabio had been stabbed several times in the face and body and was found bleeding profusely on the patio of their gated home in the upscale Woodland Hills neighborhood of Los Angeles on January 23. 

He died at the scene.

Fabio worked for decades as a trendsetting hair stylist and served as vice president of education for beauty products giant Coty Inc.