The Nebraska Panhandle police chief who’d been put on administrative leave has resigned.

Kimball Police Chief Mark Simpson’s resignation was effective Monday. He’d been on leave since March 15, following challenges to the accuracy of information he’d presented to another law enforcement agency.

Kimball Mayor James Schnell declined to elaborate on reports of what he said were “suspicious fallacies” regarding Simpson.

In Simpson’s resignation letter, he says he regrets not being able to serve Kimball’s residents any longer and that people need to trust city officials and let them do their jobs. Simpson also says in the letter that he’s sorry he “did not uphold my side of the bargain.”