"After humbly serving my communities, departments and personnel over 35 years in law enforcement, I have been placed in a position that makes my ability to effectively, professionally and safely impact those groups unachievable,'' Chamberlain said in written a statement.
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Chamberlain added that he could not "support modifications to my position, the organization and most importantly, the community --students, staff and families -- that I believe will be detrimental and potentially life-threatening.''
It's unclear who will take over leadership of the department but a decision on the leadership transition is "forthcoming," a Los Angeles Unified School District spokeswoman told Eyewitness News.
L.A. school board approves cuts to school police following weeks of protests
Chamberlain, a 33-year law enforcement veteran, became chief of school police in December. He took the job after retiring as a commander with the Los Angeles Police Department.
His resignation comes after a split vote by the LAUSD Board of Education Tuesday to reduce the agency's budget by $25 million in response to weeks of protests calling for officials to "defund" the police.
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The board action also calls for officers to give up their uniforms and patrol off campus, and will lead to the layoffs of 65 officers in the 471-employee department.
The money will instead be used to fund staffing that specially serves the needs of Black students and a task force to study campus safety.
City News Service contributed to this report.