Interim Police Chief Jen Louis has said she was not aware of derogatory text messages that were leaked this month.
The messages drew condemnation as city officials pledged to investigate the “disturbing” comments.
Hansel Aguilar runs a similar law enforcement oversight agency in Charlottesville, Virginia.
Tony Walker described himself as a “washed-up nobody” who probably deserved to die in prison.
Until now, the motive for the fatal shooting has been shrouded in mystery. That is set to change Monday as part of a recent plea deal.
It says unlawful changes were made to police misconduct investigations.
The city did not respond to multiple requests for comment from Berkeleyside.