Joe Buscaino, a senior lead officer with the Los Angeles Police Department, beat Assemblyman Warren Furutani, a former member of the Los Angeles Unified School District Board of Education and Community College Board of Trustees.
Buscaino had 9,734 votes, 60.69 percent, to Furutani's 6,304, 39.31 percent, with all 94 precincts reporting and vote-by-mail ballots counted, according to figures released by the City Clerk's Office.
The seat was left vacant after Janice Hahn was elected to congress in July. The district stretches from Watts to San Pedro.
City News Service contributed to this story.