O’Malley graduated from
Carondelet High School in 1971. O'Malley was appointed Alameda County district attorney in 2009 by the Board of Supervisors when her predecessor,
Tom Orloff, retired. She ran unopposed in 2010 and 2014. On June 13, 2019, just after the Toronto Raptors clinched the NBA title over the Golden State Warriors, Raptors President Masai Ujiri was allegedly involved in an altercation with an Alameda County sheriff's deputy. The sheriff's office was expected to file reports with the district attorney's office. If filed, O'Malley would decide whether to bring charges against Ujiri. The investigation ended on September 21. Following a private meeting on October 21, 2019, with Ujiri, his attorneys and Assistant District Attorney Terry Wiley, which was held at the sheriff's department, Assistant District Attorney Teresa Drenick wrote in an email to
The Toronto Star that the district attorney's office would not be "taking any further action". O’Malley did not charge the sheriff deputy who was proven to have lied in sworn reports.
2018 district attorney campaign In 2018, O'Malley faced a challenge from a criminal defense and Oakland civil rights attorney
Pamela Price, running on policy of police accountability. The individual that ran against her in 2018, Price, succeeded her. ==References==