Friday marked Keechant Sewell’s last day as police commissioner after 18 months on the job, and for now, the top job is being filled by her second-in-command — though it remains unclear when the mayor will name a permanent replacement.

Sewell was the focus of attention at an NYPD promotion ceremony, where she received multiple ovations in her final public appearance.

The department also publicly released a tribute video, a sign of the respect and admiration she earned since taking the job in January 2022.

Sewell’s surprise resignation earlier this month remains something of a puzzle. Neither she nor Mayor Eric Adams has given a public explanation, though according to multiple published reports, Sewell felt undermined by the administration, with Adams and Deputy Mayor for Public Safety Philip Banks both exerting authority over the department.

Adams, who made her the city’s first female police commissioner upon taking office last year, has pushed back forcefully on any suggestion of internal strife.

On Friday, he praised Sewell for turning the tide on violent crime, with most crime categories now trending in the right direction.

“I want to thank her for sending a message — one, that she was a real crime fighter,” he said in a radio interview on 1010 WINS. “Two, to women across the entire country, they know now they can run major law enforcement agencies.”

Adams confirmed that First Deputy Commissioner Edward Caban will lead the agency until a permanent commissioner is named.

And Caban is thought to be a leading candidate: He’s spent more than 30 years in the department and would be the first Latino to hold the position.

The mayor has not indicated when an announcement might come.

As for Sewell, in her final public remarks, she delivered this advice to police personnel receiving promotions: “I ask you to lead and serve with integrity, courage and compassion.”

“I will be watching,” she continued.