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Advocate staff photo by JOHN McCUSKER -- Former New Orleans police superintendent Ronal Serpas on Monday ruled out a bid for Orleans Parish Sheriff -- an office he had flirted with seeking. The three-day qualifying period begins Wednesday. Here, Serpas, at right, announces his retirement from NOPD at a press conference on Aug. 18, 2014. Serpas is now a professor of criminal justice at Loyola University.

Ronal Serpas is taking a pass on politics.

The former New Orleans Police Department superintendent, who was rumored to be considering a bid to challenge Orleans Parish Sheriff Marlin Gusman in the fall, said Monday he would not be running.

"I am very happy here at Loyola University New Orleans," Serpas said in an email in which he flatly rejected a bid.

Serpas, who has never sought elected office, secured a tenured post as a "professor of practice" at Loyola shortly after Mayor Mitch Landrieu tossed him from the police chief's job in August 2014 after four tumultuous years.

During his retirement from public service, the former chief has grown increasingly critical of Landrieu, his former boss, in tweets about the city's swelling violent crime rate, and political insiders had said he was exploring a possible campaign for what sometimes is viewed as the second-most powerful post in New Orleans city politics.

Serpas did nothing to quell the speculation last month, sidestepping answers about a bid for the sheriff's post.

His rejection of that idea Monday came two days before the start to the three-day candidate qualifying period for the fall elections.

No other names have emerged thus far to challenge Gusman, who is expected to seek his fourth full term in office.

Gusman became sheriff after serving as former Mayor Marc Morial's chief administrative officer, followed by a stint on the City Council. He won his current term in convincing fashion in a 2014 runoff with former Sheriff Charles Foti.

Follow John Simerman on Twitter, @johnsimerman.