The chancellor of the University of California, Davis, who was placed on administrative leave amid allegations that she used university money to eliminate negative online search results about the institution, resigned on Tuesday after an investigation found that she had violated several university policies.

The chancellor, Linda P. B. Katehi, courted controversy over a series of purported actions, including the use of university funds to suppress the search results after a 2011 episode in which campus police officers used pepper spray against seated protesters, many of them students.

When Ms. Katehi was placed on administrative leave in April, Janet Napolitano, the president of the University of California system and a former secretary of Homeland Security, said that the university was investigating the truthfulness of Ms. Katehi’s accounts of her involvement with social media contracts, as well as questions about the campus’s employment and compensation of some of her immediate family members.

“The investigation is now concluded, and it found numerous instances where Chancellor Katehi was not candid either with me, the press, or the public; that she exercised poor judgment; and violated multiple university policies,” Ms. Napolitano said in a statement on Tuesday.