The infant involved in the fatal San Francisco bus stop crash has died, raising the death toll to four, officials said.

During the San Francisco Police Commission meeting on Wednesday night San Francisco Police Chief William Scott mentioned that the infant in the crash had died.

USA TODAY has reached out to the SFPD and the San Francisco Office of the Medical Examiner for additional information. SFPD has confirmed the infant's death and the medical examiner has confirmed the victims' identities to KPIX and KTVU.

The infant was a 3-month-old named Caue, KTVU reported. His father Diego Cardoso de Oliveira, 40, and brother Joaquim, 1, died at the scene. His mother 38-year-old Matilde Moncada Ramos Pinto, died in the hospital the following day.

The family was waiting for the bus on the intersection of Ulloa Street and Lenox Way in the West Portal neighborhood when an SUV crashed into the bus stop at around noon on Saturday, authorities said.

In a statement on X following the accident, Mayor London Breed called the collision "tragic."

"I’ve just visited the scene and it is heartbreaking. We will share more information when we can, but now our focus is on the victims and their families," Breed said.

Driver arrested

The driver in the crash, 78-year-old Mary Fong Lau, was transported to the hospital alongside the infant and his mother following the crash.

On Monday, police announced that Lau was arrested and booked on suspicion of three counts of felony vehicular manslaughter, felony reckless driving causing bodily injury, and additional traffic violations.

Lau's attorney, Sam Geller told USA TODAY in a statement that she's been released from police custody and the hospital. Geller said prosecutors have not formally charged Lau with any crime as of yet and "the matter is under further investigation to determine if there was any wrongdoing or malfeasance that would lead to charges being filed."

According to a statement from Lau and her family, she "has been fully cooperating with investigators and will continue to do so."

"Ms. Lau and her family join the community in mourning the tragic loss of life that occurred in West Portal over the weekend," the statement said. Residents have been leaving flowers at a growing memorial on the accident site and a vigil was held for the family on Monday, KTVU reported.

"Our whole city is grieving this, and I think we should be," Marta Lindsey of the pedestrian safety advocacy group Walk SF told KTVU. "Part of that is because so many of us are feeling how dangerous our streets are too often and that feeling that it could have been me, or it could have been any of us." 

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