Driver’s fiancé also arrested for being accessory, destroying evidence
By Ted Asregadoo, PIO, Contra Costa District Attorney’s Office
The Contra Costa District Attorney’s Office has filed a four-count complaint against a 34-year-old Pittsburg man for his role in a hit-and-run collision that took the life of a 17-year-old female pedestrian, Brooke Jeffrey.
Roberto Matthew Sainez, Jr. was arraigned in Superior Court in Martinez Friday, on vehicular manslaughter, a hit and run that resulted in the death of another person, destroying evidence, and driving with a suspended or revoked license for a DUI conviction. The manslaughter charge comes with an enhancement of fleeing the scene after committing the offense.
The incident occurred around 7:15 pm on March 7th, 2023, near Black Diamond High School in Pittsburg. Pittsburg Police received a call about a pedestrian who appeared unconscious and likely hit by a vehicle. When police arrived on the scene at Stoneman Avenue near Briarcliff Drive, they found the teen lying in the center of the road. Police and medical personnel administered life-saving measures. However, the teen was pronounced dead after being transported to a local hospital.
Pittsburg Police initiated an investigation of the incident — which led them to Mr. Sainez as a suspect. He was arrested on March 15th and booked into the Martinez Detention Facility. During
the arraignment, Deputy District Attorney Jeff Kolko noted that Sainez not only fled the scene after striking the teen with his vehicle, but also took action to cover up the evidence. A family member of the victim also spoke in court asking Judge Nancy Davis Stark to consider the lack of
remorse in Sainez’s actions. After hearing from the victim’s family member and Mr. Kolko’s request to increase Sainez’s bail, the judge increased the bail amount from $200,000 to $1,000,000.
Case No. 04-23-00363 | The People of the State of California vs. Sainez, Roberto Matthew
Driver’s 30-year-old Fiancé Also Arrested
According to a Pittsburg Police press release on Thursday, March 16, The District Attorney’s Office filed the following charges in relation to the fatal hit-and-run crash of 17-year-old Brooke Jeffrey:
Sainez, Roberto Jr.
PC 192(c)(1) – Vehicular Manslaughter; enhancement of CVC 20001(c) – Fleeing Scene of a Crime
CVC 20001(b)(2) – Hit and Run Resulting in Death
PC 135 – Destruction of Evidence
CVC 14601.2(a) – Suspended License for DUI
Today, Pittsburg PD investigators arrested 34-year-old Roberto Sainez from Pittsburg for the hit-and-run collision that killed a teenage girl. Sainez’ fiancé, 30-year-old Vanessa Landeros, was also arrested.
Sainez was booked on the following charges:
- PC 192(c) – Vehicular Manslaughter
- PC 135 – Destroying or Concealing Evidence
- CVC 20001 Felony Hit & Run
- CVC 20003 Hit & Run resulting in a death
- CVC 14601.2 – Suspended License for DUI
- CVC 14601.4 – Driving on a suspended or revoked license and causing bodily injury
- CVC 14601.5 – Driving on a Suspended License due to DUI
Landeros was booked on the following charges:
- PC 32 – Accessory after the fact
- PC 135 – Destroying or Concealing Evidence
The two were arrested in the 3000 block of Gladstone Drive in Pittsburg where investigators were serving a search warrant.
On March 7th, Pittsburg police officers responded to Stoneman Avenue and Briarcliff Drive where a 17-year-old pedestrian was fatally struck by a vehicle, which then fled the area. From the onset, this case was handled with an all-hands-on deck approach and investigators worked diligently, following all investigative leads that led to these arrests. This included reviewing of countless hours of video surveillance, which aided in the identification of the suspect vehicle and ultimately the suspects. Investigators served several search warrants in this case to include two Pittsburg residences, a Pittsburg business, and a property in Sonoma County which also led to the recovery of the vehicle involved in the collision.
We are extremely proud of the swift and hard work our detectives, fatal traffic investigators and evidence technician put into this case to provide the family closure and justice. Please understand that there are times, particularly in sensitive cases, where we cannot issue information prematurely to protect the integrity of the investigation.
We would like to thank our community for their cooperation in this investigation. In the coming days, investigators will be presenting this case to the Contra Costa District Attorney’s Office for the filing of formal charges. This is still an active investigation. Anyone who has additional information related to this case should contact Detective Gutierrez at 925-252-4095 or Detective Elmore at 925-252-4875.
Allen D. Payton contributed to this report.
Leave a Reply