Cocaine-fueled final hours of models' lives revealed before Beverly Hills 'killer' uttered 4 chilling words

A friend who witnessed the cocaine-fueled final hours of two models' lives has revealed what really happened the night they were left for dead in a Beverly Hills tragedy. 

Christy Giles, 24, and Hilda Marcela Cabrales Arzola, 26, were dumped at separate hospitals by masked men in November 2021. Giles died shortly after being deposited for doctors, while Arzola spent 15 days in a coma before dying. 

David Brian Pearce, 40, is now on trial for their murders. 

Prosecutors say he gave them a lethal combination of cocaine, fentanyl and the date rape drug GBH before callously discarding their bodies. 

At his Los Angeles trial on Thursday, witness Michael Ansbach described the sad and seedy final hours of the women's lives.

He said Pearce handed him a vodka drink that 'tasted awful' and made him feel 'immediately dizzy'.  

He also remembered the moment Pearce brought out the 'good stuff' - which he was under the belief was merely cocaine - that he, alongside victims Christy Giles, 24, and Hilda Marcela Cabrales Arzola, 26, took together. 

Later, Ansbach recalled being terrified that something was wrong with the women, who laid like stones on the ground, and worried Pearce would do nothing to help them, especially after he told him: 'Dead girls don't talk.' 

After taking the 'good' cocaine, Ansbach immediately knew something wasn't right. His nostrils burned and he became overwhelmed with pain, he told the jury. 

'I felt incredibly weak… like it was taking over me… it was like a tranquilizer,' he told the court.  

When he asked Pearce what he had given them, his friend merely laughed and looked like 'the devil personified right in front of me,' Ansbach claimed. 

Ansbach would spend hours vomiting before he noticed Giles 'didn't appear to be alive' anymore and that Arzola wasn't moving either. 

He began pleading with the producer to get the women help, but he recalled Pearce shrugging him off. 

'Dead girls don’t talk,' Pearce, who has pleaded not guilty to murder, allegedly replied. 

'It’s a phrase that echoes in my nightmares and disturbs me,' Ansbach told the courtroom. '[He was] really only concerned about himself.' 

Pearce was allegedly worried about his prior criminal history and told Ansbach: 'This can't happen to me.' 

Ansbach claimed he checked Giles' pulse and found none, but insisted Pearce continued to do nothing to help them.  

The women were eventually dropped off at two different hospitals by a car with no plates nearly 12 hours later. 

A toxicology report found the common date-rape drug, gamma-hydroxybutyrate (GHB), in Giles' system. 

Giles was pronounced dead shortly after she was found. Arzola passed away 15 days later after being in a coma.  

Pearce and his roommate Brandt Osborn are accused of ditching the women at the hospitals after they overdosed. 

Prosecutors alleged Osborn helped transport the women and destroyed evidence inside the apartment. 

Both men have denied wrongdoing. Their attorneys also pointed out that Ansbach's story changed from the time he was taken in for questioning to sitting before a jury. 

In his first interview with police, he said he never saw Giles and Arzola do drugs and painted a different picture of Pearce. 

He admitted to lying to police because he was 'scared.' 

'I’d never been in that situation before, and I had no idea what to do,' he told the court. 

'So you lied?' attorney Jeff Voll asked. 

'Yeah,' he replied. 

Ansbach has not been charged with any crimes.   

Pearce is also facing seven rape charges for sexual assaults he allegedly performed between 2005 and 2021, according to The Los Angeles Times. 

In 2014, prosecutors originally declined to pursue sexual assault charges against him, but after the deaths, several women came forward with stories. 

Some of the women alleged they fell ill after Pearce served them a drink and later woke up to him sexually assaulting them, according to The Los Angeles Times.