Husband of slain UCSF social worker sues San Francisco over hospital security
Rule Changes San Francisco, CA localLawsuit says the city knew when the attacker would return and a deputy was out of sight when the stabbing began
Overview
Alberto Rangel, a 51-year-old social worker at Zuckerberg San Francisco General Hospital's HIV clinic, was fatally stabbed by a patient on Dec. 4, 2025. His husband, Stuart Moulder, sued San Francisco on Oct. 21, 2026, saying the city knew when the attacker planned to return but failed to protect him.
The suit says a hospital security director got warnings about the attacker, promised to protect Ward 86 staff and called the sheriff's office at 12:28 p.m. A deputy arrived around 1 p.m.; the suit says he was down a hallway, out of sight, when the stabbing began at 1:30. Moulder's lawyer, Nick Casper, argues the threat was specific and known in advance, so the city should answer for it.
Why it matters
If the lawsuit succeeds, it could force hospitals across California to treat staff safety threats as legal liabilities, not optional improvements.
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Key Indicators
Related Media
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Voices
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People Involved
Organizations Involved
The public university that employed Rangel at the city-run hospital.
The hospital's Ward 86 is the HIV clinic where the fatal stabbing occurred.
The agency that oversees Zuckerberg San Francisco General Hospital and manages security contracts.
The sheriff's office provided deputized security at ZSFG. Eyewitnesses said a deputy failed to intervene immediately during the attack, contradicting the office's public statements.
The union representing UCSF technical and professional workers, including social workers.
Timeline
December 2025 October 2026
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Lawsuit filed against city
Latest LegalMoulder sues San Francisco in Superior Court, alleging 'woefully inadequate security' and that staff warnings were ignored.
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City denies wrongful death claim
LegalSan Francisco denies Moulder's claim, clearing the way for the lawsuit filed in October.
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Wrongful death claim filed with city
LegalMoulder submits a claim for damages, alleging negligence.
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Attacker pleads not guilty
LegalTortolero-Arriechi pleads not guilty to murder; the criminal case is ongoing.
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Alberto Rangel fatally stabbed at ZSFG
IncidentPatient Wilfredo Tortolero-Arriechi attacks Rangel with a kitchen knife in Ward 86 hallway; Rangel dies two days later.
Scenarios
City settles lawsuit, pays damages and furthers security reforms
Discussed by: Legal analysts and San Francisco Chronicle coverage
The city, facing liability for foreseeable harm, negotiates a settlement with Moulder. The agreement would include financial compensation and a commitment to keep the $15M annual security funding and possibly expand it. Settlement avoids a lengthy trial and public testimony from deputies.
Case proceeds to trial; city found negligent
Discussed by: Plaintiff's attorney Nick Casper, UPTE union
If settlement talks fail, the case goes to trial. Moulder's evidence includes staff warnings, the sheriff's deputy's failure to act, and the absence of a safety plan. A jury could award damages and set a precedent for hospital security liability.
Court dismisses case or city wins at trial
Discussed by: City Attorney's Office, defense attorneys
The city argues it had no legal duty to protect Rangel from a specific patient's criminal act, or that its security response was reasonable. A judge could grant summary judgment or a jury could find the city not liable.