The property had been purchased in late 2017 or early 2018 and listed on Airbnb by September of that year. A later lawsuit would allege the owners had never lived in the house, buying it specifically as a short-term rental. In February 2019, the listing advertised the home as suitable for large parties with up to 30 guests at $800 per night. Neighbors had already raised concerns: one complained in 2018 about renters blocking his driveway, and city records showed occupancy and parking violations issued in March 2019. By the time a renter booked the house for a single night on Halloween, the listing terms had tightened. No parties were allowed. The owner told the renter so explicitly. It did not matter. The party was promoted on social media, and by the evening of October 31, the home was packed well beyond any capacity its walls were built to hold.

At 10:50 p.m., reports of gunshots brought police to the short-term rental. When officers arrived, partygoers were already fleeing into the surrounding streets. Inside, the scene was devastating. Four men in their twenties were dead or dying. Thompkins, the youngest victim, was rushed to the hospital but would not survive the night. Several others were injured by gunfire or in the panicked escape -- one person jumped from a balcony to get away. Two firearms were recovered from the house. The Contra Costa County Sheriff's Office described the scene as a "bloodbath." Every Orinda police officer had been deployed to Oakland for mutual aid that night; the response came from surrounding jurisdictions.

Detectives quickly identified connections to San Francisco gang activity. Two of the victims were members of the Page Street Mob, and one was the younger brother of a man charged in a 2015 quadruple homicide in Hayes Valley. The San Francisco Police Department joined the investigation, suspecting the Orinda shooting might be retaliatory. On November 14, five men from Bay Area cities -- San Mateo, Marin City, Vallejo, and Antioch -- were arrested on probable cause warrants. Four faced murder and conspiracy charges; a fifth, identified as a party promoter, was charged as an accessory. But the Contra Costa County District Attorney's office declined to file charges, determining the evidence fell short of proof beyond a reasonable doubt. Two more suspects were arrested a week later on weapons charges, with a seized gun linked to multiple shootings. Then the trail went cold. Witnesses stopped cooperating. By February 2020, the investigation had stalled. The case remains open and unsolved.

The shooting's aftershocks rippled far beyond Orinda's wooded hills. Within 48 hours, Airbnb CEO Brian Chesky announced a company-wide ban on "party houses" and pledged to screen for high-risk reservations. By December 2019, the platform had banned open-invitation parties at all listings, with limited exceptions for professional event venues. The Orinda City Council passed an emergency ordinance banning short-term rentals unless the host lived on the property, extending it repeatedly through 2021. But some residents and victims' families felt the conversation had veered in the wrong direction -- that the focus on Airbnb policy overshadowed the human toll. A lawyer for one victim's family criticized what they called "racially charged insensitivity" in the public response, noting that all five victims were persons of color and questioning whether the media coverage matched what similar tragedies received elsewhere. Airbnb responded by covering funeral costs and counseling for the families.

Memorials appeared at the house and at a fountain near Orinda Theater Square -- flowers, photographs, handwritten notes. But the most enduring memorial took a different form. Oshiana Thompkins' mother, channeling grief into the purpose her daughter had articulated before she died, established a nonprofit foundation in 2021. By April 2022, the Oshiana Thompkins Community Center was operating in El Sobrante, offering the kind of youth programming Oshiana had envisioned. In Orinda, the quiet streets returned to their routine, and the house became just another address in the hills. The policy changes remained -- Airbnb's party ban became permanent. The legal questions persisted -- lawsuits alleged the property owners bore responsibility for enabling the conditions that led to the violence. The case file stayed open, waiting for evidence that might never come. But in El Sobrante, teenagers walked through the doors of a community center that exists because a nineteen-year-old once said she wanted to build one.