PHOENIX -- The Maricopa County Sheriff's Office wants the Pima County Administrator to fire the county's chief legal defender, according to a letter sent to the administrator's office.

Chief Legal Defender Isabel Garcia appeared at Sheriff Joe Arpaio's book signing in Tucson last week and reportedly participated in a mock assault and decapitation of the Maricopa County sheriff.

"Her actions suggested her minions violently assault Sheriff Arpaio," wrote Maricopa County Deputy Chief John McIntyre in a letter to Pima County Administrator Chuck Huckleberry. "This is a travesty."

McIntyre also chided Huckleberry for using a "head-in-the-sand approach that Ms. Garcia can do whatever she wants on her own time."

For his part, Arpaio said he was "disgusted" with Garcia's conduct.

"As an officer of the court and a person in a position of public trust, her actions reflect poorly on Pima County," Arpaio said.