During more than three years in charge of the country’s second-largest municipal police force, Superintendent Johnson led an overhaul in training, introduced more restrictive rules for when officers could use force and guided the department into a court-enforced consent decree. After a dramatic rise in homicides early in his tenure, the murder rate had steadily dropped.
But the superintendent faced mounting problems, especially in recent weeks. He requested an investigation of himself last month after being found asleep in a parked S.U.V. late at night. Superintendent Johnson blamed the episode on medication, but Chicago’s mayor later said he had been drinking that evening. Days later, the superintendent lost a vote of no-confidence by leaders of the city’s main police union.
The superintendent’s departure leaves the city and its new mayor, Ms. Lightfoot, facing difficult choices on what type of leader to select for a department that has faced intense criticism over crime levels but also distrust from residents.
After video of the shooting of Laquan McDonald was released in late 2015, protesters marched for weeks, the city’s top police official was fired and a national search for a new superintendent ended with a political stalemate. Superintendent Johnson had not applied for the top job, but eventually was tapped.
When Superintendent Johnson took office in 2016, Chicago was in the midst of what would become its deadliest year in two decades, with more than 760 homicides, the most of any American city. The violence terrified residents, drew national attention and helped make the city a favorite target of President Trump, who at one point said he would “send in the Feds!” to address the city’s “carnage.”