Chilling three words woman said to brother after murdering her ex-boyfriends lover in bed

A California Halloween party ended with the killing of a 19-year-old woman that shocked even seasoned investigators.

The murder of Leilani Marie Beauchamp, carried out by a jealous brother and sister duo, culminated in a chilling statement between the siblings that sends shivers down the spine: We killed someone.

It was October 30, 2021, when Beauchamps disappearance from a Halloween party in Sacramento set off a chain of events that revealed a gruesome tale of jealousy, betrayal, and murder.

The young womans life was cut short in a manner as senseless as it was brutal, with Beauchamps final moments spent in the bed of Jessica Quintanillas ex-boyfriend - a fact that became central to the crimes unraveling.

Leilani was said to have been bright and beloved, had just left the Halloween party, unaware that it would lead her into a fatal encounter with Jessica Quintanilla. 

The victim accompanied two active-duty Air Force airmen to their home in nearby Fairfield, not knowing that she would never return.

In a fit of rage, 24-year-old Jessica Quintanilla confronted Beauchamp and her ex-boyfriend seeking answer. But it was during the confrontation, a gun was fired.

Quintanilla would later claim on the witness stand that the shooting was an accident, explaining how she was hungover and upset, and that the gun went off during the altercation. 

Jessica Quintanilla, 24, was jailed for 25 years to life for the killing whilst her brother Marco Quintanilla, 30, became an unwitting accomplice and was jailed for four years

Leilani Marie Beauchamp, 19, was murdered by a jealous brother and sister duo, culminated in a chilling statement between the siblings: We killed someone

Police said Beauchamp was murdered inside this home in Fairfield, California before her body was dumped 130 miles away in Salinas, California

But prosecutors painted a much darker picture, calling the act a deliberate murder driven by a jealous rage.

Following the fatal shooting, Quintanillas brother, Marco Quintanilla, 30, became an unwitting accomplice. 

The two siblings, along with one of the airmen who lived at the house, disposed of Leilanis body in Salinas, more than 130 miles away. 

At some point during their attempt to cover up the crime, Jessica reportedly turned to her brother and uttered the chilling words, We killed someone. 

Her words came back to haunt her as they echoed in the courtroom with Marco later testifying in court how he initially thought his sisters words were a macabre joke. They were anything but.

The case unraveled swiftly with authorities discovering the murder scene in Fairfield after Leilani was reported missing. 

The airman who helped dispose of the body led investigators to its location, later receiving immunity in exchange for his testimony. 

His account provided damning details, including the chilling threats Jessica allegedly made to silence him. She told me she would kill me if I said anything, he testified.

Leilani Marie Beauchamp, 19, was said to have been bright and beloved, had just left the Halloween party, unaware that it would lead her into a fatal encounter with Jessica Quintanilla

Leilani was truly a blessing to us and her beloved friends. We will miss her smile, her laugh, her caring demeanor, her strong will, her passion for life, and the love she brought to our family. We love you, Leilani, the familys said

Jessica Quintanillas defense attorney, William Alan Welch, described the shooting as a tragic accident, claiming it was the quintessential heat of passion action. But the jury was not swayed. 

Chief Deputy District Attorney Paul Sequeira suggested the motive may have stemmed from a complex love triangle.

In November, Jessica was convicted of murder, and she has now been sentenced to 25 years to life in prison. 

Marco Quintanilla, meanwhile, was sentenced to four years as an accessory to the crime.

The victims family was left shattered. In a heartfelt statement, they described Beauchamp as a blessing whose light had been extinguished far too soon. 

Leilani was truly a blessing to us and her beloved friends, the familys said. We will miss her smile, her laugh, her caring demeanor, her strong will, her passion for life, and the love she brought to our family. We love you, Leilani.