The Regional Transportation District is without a police chief after Joel Fitzgerald Sr., on leave since July 1, officially split with the transit agency on Friday, RTD officials confirmed. It is not clear if Fitzgerald chose to leave his position with RTD’s internal police force or if he was fired.

CBS News Colorado learned Friday that RTD Police Chief Joel Fitzgerald is no longer with the agency as of Sept. 20.

“I want to thank Dr. Fitzgerald for his service to the agency over the last two years and wish him well in his future endeavors,” RTD General Manager and CEO Debra Johnson wrote in a memo emailed to all agency staff on Friday. It’s unclear whether Fitzgerald resigned or was fired. Johnson has also refused to explain why Fitzgerald was on leave.

DENVER — The Regional Transportation District's chief of police is no longer with that organization. On Friday, an RTD spokesperson confirmed Joel Fitzgerald is "no longer chief of police." They did not give any more information about the circumstances surrounding his departure, including whether he resigned or was fired.