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San Mateo Supervisors Close Investigation Clearing County Executive of Sheriff’s Allegations

The Board of Supervisors unanimously voted to release the report exonerating County Executive Mike Callagy and formally closed Sheriff Christina Corpus’s complaint.

San Mateo County Executive Mike Callagy, left, and San Mateo County Attorney John Nibbelin, right, at a special Board of Supervisors meeting on Thursday, May 22. Photo by Arden Margulis.
San Mateo County’s Board of Supervisors. (May 22, 2025)
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Overview

  • The San Mateo County Board of Supervisors voted unanimously on May 22 to release an independent investigation report into Sheriff Christina Corpus’s allegations against County Executive Mike Callagy.
  • The investigation, conducted by Oppenheimer Investigations Group LLP, found no evidence to support Corpus’s claims of discrimination, harassment, or retaliation by Callagy.
  • The supervisors also voted to consider Corpus’s complaint closed, signaling no further action on the matter by the county.
  • The report follows months of escalating tensions, including a prior investigation that substantiated misconduct claims against Corpus, leading to calls for her resignation and the passage of Measure A granting the Board removal powers.
  • Legal disputes between Corpus and Callagy continue, including a $10.5 million defamation complaint filed by Callagy against Corpus and her chief of staff.