"It is with great sorrow we report this young girl has passed away. Our deepest condolences to her parents and family. We will continue to support them through this difficult time," officials said in a post on the sheriff's office Twitter page.
The situation unfolded as deputies and paramedics responded to the private club at 707 Country Club Cir., off Castlewood Drive in unincorporated Pleasanton, around 2:25 p.m. Sunday on a report of an accidental near-drowning, according to Kelly.
Cai, a guest of a Castlewood member family, was playing in the pool but the situation turned dangerous "very quickly" when she became unresponsive under water, Kelly said. A lifeguard pulled the girl from the pool within seconds and began CPR and emergency first aid.
First responders then arrived, with paramedics taking over and transporting her to Stanford Health Care-ValleyCare hospital in Pleasanton, according to Kelly. She was then taken to UCSF Benioff Children's Hospital Oakland, where she remained on life support in critical condition since late Sunday.
Cai died just after midnight Wednesday, according to Kelly.
Castlewood general manager John Vest offered condolences on behalf of the club later Wednesday morning, saying, "Our thoughts and prayers are with the family. This is a horrible tragedy. We are cooperating with authorities and providing responses as requested. Counselors are available for members and club associates."
Grief support is also available at local schools for those affected by Cai's death. Pleasanton Unified School District officials confirmed the girl attended a local school, but they declined to identify which campus out of respect for the family's request for privacy.
"We are deeply saddened to learn of this tragic loss," PUSD Superintendent David Haglund said. "The loss of a child is incredibly difficult and we want to ensure that our families and students know that support is available to them. We will have grief counselors and other resources and supports available."
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