Chicago Mayor Lori Lightfoot fired the city’s retiring police superintendent Monday, citing “ethical lapses” that included telling lies about a recent incident in which Eddie Johnson was found asleep at the wheel of his car after having drinks.

Named to the job in the wake of a police shooting that killed a black teenager, Johnson was dismissed after the mayor reviewed an inspector general’s report and video evidence related to the night in mid-October when officers discovered him unconscious in his SUV at a stop sign. He initially blamed his failure to take his blood pressure medication and said he had a few drinks with dinner earlier in the evening.

The officers did not conduct any sobriety tests and let their boss drive home. It was unclear if they would be disciplined.

Johnson “engaged in a series of actions that are intolerable for any leader or position of trust, particularly the head of the Chicago Police Department,” the mayor said. His conduct was “not only unbecoming but demonstrates a series of ethical lapses and flawed decision-making.”

Lightfoot said the police chief of the nation’s third-largest city repeatedly lied about the events that unfolded the night of Oct. 16 and morning of Oct. 17.

“What he portrayed to me, what he portrayed to the public was fundamentally different than what the facts show,” she said. The underlying conduct “warranted this significant and serious action of relieving him of his role.”

At a hastily called news conference, the mayor declined to offer details “out of deference” to Johnson’s family and the ongoing investigation.

“While at some point, the inspector general’s report may become public and those details may be revealed, I don’t feel like it is appropriate or fair to Mr. Johnson’s wife or children to do so at this time,” Lightfoot said.

Former Los Angeles Police Chief Charlie Beck, who was already named interim superintendent in Chicago, was to take over the department of 13,500 officers immediately, Lightfoot said.

A Chicago police spokesman did not immediately return messages seeking comment from Johnson, who in more than 30 years with the department held almost every rank on the force. He declined to discuss his firing  with a Sun-Times reporter who came to his South Side home.

In October, Johnson called for the department’s internal affairs division to investigate the incident, saying he wanted the public to be confident that both he and the officers acted properly. He said he felt lightheaded while driving home, pulled over and fell asleep. Earlier in his tenure, he was hospitalized for a blood clot and kidney transplant.

Before he officially announced his retirement in November, Johnson told reporters he had been toying with the idea for some time, denying that it had anything to do with the incident. He said he did not care about making it to April as police chief, when his pension was to become fully vested at the superintendent’s salary, which is about $260,000 a year. Days later, he appeared with Lightfoot at an emotional news conference commemorating his long career, an appearance that Lightfoot said Monday she now regretted.

“This department has to be about creating a culture of integrity and accountability, and that’s what we’re going to do,” Lightfoot said.

A city spokeswoman declined to discuss the status of Johnson’s pension, citing the investigation.

Johnson, 59, was named superintendent in 2016 by then-Mayor Rahm Emanuel, who had fired Superintendent Garry McCarthy after the release of the now-infamous video showing officer Jason Van Dyke shooting teenager Laquan McDonald. At the time, Emanuel was scrambling to restore public confidence.

Eschewing the recommendations of his police board that conducted a national search, Emanuel settled on Johnson, a native Chicagoan and interim superintendent who had not even applied for the job. An African American who spent his early childhood living in one of the city’s most notorious public housing projects, the soft-spoken Johnson was a popular choice with the rank-and-file who felt they could trust him far more than McCarthy, a brash outsider who spent most of his career in New York.

Johnson took over the department as the city grappled with a spike in already high violent crime. By the end of the year, the number of dead totaled nearly 800 — or 300 more than just the year before.

He presided over an effort to hire more officers that increased the size of the force by about 1,000. Under his leadership, police also expanded the use of technology, including installing more surveillance cameras and embarking on the largest rollout of police body cameras in the country.

As the McDonald case advanced through the courts, Johnson looked for ways to restore public confidence that had been shattered by allegations that police engaged in a cover-up. The video was withheld from the public for months.

Questions about Johnson’s willingness to cover for fellow officers arose after media reports that, as a deputy chief, he agreed after watching the video that the shooting was justified.

In a blistering report, the Justice Department found a long history in the police force of racial bias and excessive force by officers. That led to wholesale changes in the way officers are investigated and last year the implementation of a settlement known as a federal consent decree, which calls for more community policing, better officer training and requiring paperwork every time officers point a gun at someone, even if they don’t fire.

Johnson largely enjoyed support from the public and his department, partly because he was willing to show his human side. He became emotional when he faced reporters to talk about the shooting death of a longtime commander and close friend. He showed anger when he announced the arrest of actor Jussie Smollett, casting what he said was Smollett’s staged racist attack as an attack on Chicago itself. And the city rooted for him when he had a kidney transplant — a kidney he said was donated by his son.

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Associated Press writers Don Babwin and Kathleen Foody contributed to this report.