An investigation into undisclosed allegations lodged against the Selma assistant police chief showed no criminal wrongdoing, but she is stepping down from the force, the mayor announced Tuesday.

Mayor James Perkins Jr. in mid-June suspended Assistant Chief Natasha Fowlkes.

Fowlkes’ suspension came weeks after Perkins put Chief Kenta Fulford on administrative leave on April 30, the second time the mayor suspended the chief in the last 1 /2 years.

The Selma City Council last week reinstated Fulford.

Perkins on Tuesday said someone within the Selma Police Department accused Fowlkes of an illegal activity inside of the department.

“When I heard about the allegation, I immediately engaged SPD Internal Affairs Capt. Johnny King,’’ Perkins said. “Capt. King reviewed the allegation and determined that the allegation warranted further investigation. “

The mayor said he then asked the Dallas County Sheriff’s Office to carry out the investigation.

Sheriff’s officials on June 27 notified Perkins they had reviewed the case with District Attorney Robert Turner and jointly concluded “this was not a criminal offense.”

Perkins received officials noticed on Tuesday.

“I want to thank Sheriff Michael Granthum, and the Dallas County Sheriff Criminal Investigation Division for their professional execution of the investigation,’’ Perkins said.

The mayor said he then met with Fowlkes and they “engaged in some very candid discussions about her history within the Selma Police Department and about the impact the investigation had on her and her family.”

“Even though Captain Fowlkes was cleared of any criminal wrongdoing and is entitled to resume her position as assistant chief, after considering all factors, Assistant Chief Fowlkes has decided that it is in the best interest of the City of Selma, and her and her family, that she steps down as Assistant Chief of Police and tenders her resignation from the Selma Police Department,’’ Perkins said. “I agree with her decision.”

Fowlkes resignation was effective immediately.

“I want to thank her for services rendered throughout her law enforcement career with the Selma Police Department and hope for her a successful future,’’ Perkins said. “As far as I am concerned, this matter is closed, and we now continue moving forward.”