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Chicago Mayor Lori Lightfoot fired police Superintendent Eddie Johnson effective immediately Monday for reportedly intentionally misleading her and the public about his conduct when he was found asleep in his running vehicle at a stop sign after a late weeknight out in October, reports the Chicago Tribune.

"This moment needs to be a turning point for the Chicago Police Department and the way things are done in this city," said Lightfoot, emphasizing that "culture change" must take place.

The announcement came just weeks after Lightfoot held what she referred to Monday as "a celebratory press conference" to announce Johnson's retirement by year's end after about 3 ½ years at the helm.

Former Los Angeles police Chief Charlie Beck, previously named Johnson's interim successor, was on a flight to Chicago and would immediately take control of the beleaguered department, Lightfoot told reporters.

"He'll be here this afternoon," she said.