By CalNews360 Staff
Published: August 21, 2026
Five employees were injured in a stabbing inside a restaurant at Thunder Valley Casino Resort near Lincoln, California, Wednesday evening, and a fellow employee has been arrested in connection with the attack.
The incident happened around 7 p.m. on August 19 inside the Dos Coyotes Border Cafe at the casino. Deputies from the Placer County Sheriff’s Office responded within minutes and took the suspect into custody.
What happened?
According to authorities, the stabbing occurred inside the restaurant’s kitchen area.
All five victims were employees of the restaurant, and the suspect was also an employee who appeared to know the people who were attacked. Authorities have not publicly established a motive.
One victim was taken to a hospital for treatment. The other four were treated at the scene by Thunder Valley emergency medical personnel and CAL FIRE.
None of the injuries were considered life-threatening.
Who was arrested?
Authorities identified the suspect as 22-year-old Joseph Naugle, a Thunder Valley Casino employee.
Naugle was arrested at the scene and booked into the Placer County Jail on suspicion of attempted murder. He was scheduled to appear in court Friday.
The investigation remains active, and authorities have indicated that additional charges could follow.
Were casino guests in danger?
According to authorities and casino officials, the five victims and the suspect were employees, and no casino guests were involved in the incident.
Officials also said there was no ongoing threat to the public and that no additional suspects were being sought.
The casino remained open following the incident, while the restaurant where the stabbing occurred was closed as investigators worked at the scene.
Where is Thunder Valley Casino?
Thunder Valley Casino Resort is located near Lincoln in Placer County, roughly 30 miles northeast of Sacramento.
The resort is a major entertainment destination in the region, making the incident particularly concerning for employees and visitors who were at the property when the investigation began.
However, authorities have emphasized that the incident involved restaurant employees and that there was no continuing public threat.
What investigators are still trying to determine
Authorities have not released a motive for the attack.
Investigators are working to determine exactly what led to the confrontation and why the suspect allegedly attacked the five coworkers.
Because the suspect and victims worked together, investigators are also examining their relationship and the circumstances leading up to the incident.
What happens next?
Naugle is expected to appear in Placer County court as the criminal case moves forward.
The Sheriff’s Office is continuing its investigation, and additional information could emerge as detectives interview witnesses and review evidence from the restaurant.
For now, authorities have confirmed that there is no additional suspect being sought and no continuing threat to casino guests or the surrounding community.
The bottom line
Five employees were stabbed inside the Dos Coyotes restaurant at Thunder Valley Casino near Lincoln on Wednesday evening.
A 22-year-old coworker, Joseph Naugle, was arrested and booked on suspicion of attempted murder.
One victim was hospitalized and four others were treated at the scene. None of the injuries was considered life-threatening.
The investigation remains ongoing, and authorities have not yet announced a motive.
Sources: Placer County Sheriff’s Office, Los Angeles Times, NBC Bay Area and ABC7 Bay Area.
Image note: The image used with this article is AI-generated for illustrative purposes only and does not represent the actual incident, victims, suspect, restaurant, or emergency response.
