“Mr. Marshall has served in the position of CAO longer than most would have had an opportunity to do so, as a result of my being elected to a second term,” Jones said in a statement. “We are grateful to have had his service for more than five years, and we wish him well in his future endeavors. The city has benefited in many ways during his tenure.”

Jones named Christopher L. Beschler, currently the city’s deputy chief administrative officer for operations, as interim chief administrative officer. Beschler also filled that role prior to Marshall’s arrival.

“Along with Chris, we have a capable team in place – many of whom have been with me since the beginning – and we are anticipating moving forward without interruption,” Jones said.

The precise circumstances of Marshall's departure are unclear. The mayor's statement gave no information about what prompted Marshall to step down. The City Council was informed of the move on Sunday, but several council members said they did not know the reason for the resignation.

"I look forward to working with the administration on finding a suitable replacement," said Council President Charles R. Samuels, 2nd District.

A call to Marshall's cell phone resulted in a message saying the number was no longer in service.