GRAND ISLAND, Neb. (AP) — The newly-appointed interim director of the troubled Hall County Jail has resigned in the wake of questions about whether his jail management style was influenced by his son’s imprisonment for murder in Arizona.

Interim Director Randy Houser resigned late Wednesday in an email to Hall County Attorney Jack Zitterkopf. The email did not give a reason for Houser’s resignation, which came a week after he had been appointed.

But it did follow an anonymous letter to county supervisors questioning, among other things, Houser’s philosophy on jail management, given his son’s imprisonment on a first-degree murder conviction.

Houser told the newspaper Wednesday that his son’s incarceration had no bearing on his style of jail management.