Court officials announced Wednesday that U.S. District Court Chief Judge Roslyn Silver relinquished her leadership role on Sept. 3.
Silver assumed the position after Chief Judge John Roll and five others were killed in the 2011 Tucson shooting that left former Congresswoman Gabrielle Giffords and 12 others wounded.
Silver was appointed to the federal bench in 1994 by President Bill Clinton.
Judge Raner C. Collins will take over the position.
Collins lives in Tucson and was appointed to the court in 1998.
Officials say the leadership change comes as the district aims to fill six judicial vacancies.