Onis “Trey” Glenn III has resigned from his position as Region 4 Administrator of the U.S. Environmental Protection Agency after being indicted on ethics charges in Alabama.

Glenn submitted a letter of resignation dated Nov. 18 to acting EPA Administrator Andrew Wheeler, citing his intention to resign as a result of what he called “unfounded charges levied against me that I must and will fight.”

“Stepping down now, I hope removes any distraction from you and all the great people who work at EPA as you carry out the Agency’s mission,” Glenn wrote in the resignation letter, which was provided to AL.com.

“I intend to focus on my family, fight these unfounded accusations and ultimately clear my name,” Glenn wrote. The full letter is embedded below.

Glenn was appointed by Pres. Donald Trump to head Region 4 of the EPA in 2017, overseeing the eight-state Southeast region that includes Alabama, Mississippi, Georgia, Florida, Tennessee, Kentucky, North Carolina and South Carolina.

Wheeler’s chief of staff, Ryan Jackson, informed EPA Region 4 employees Monday that Mary Walker, who had been deputy regional administrator, will be the acting Region 4 administrator, The Washington Post reports.

Before working at EPA, Glenn had been head of the Alabama Department of Environmental Management, and worked as an environmental consultant in Alabama. His indictment last week dealt with work he performed before he was appointed to EPA as a consultant with Scott Phillips, a former member of the Alabama Environmental Management Commission.

Glenn and Phillips worked through a company they ran together as consultants to oppose the addition of a Superfund site in north Birmingham to the EPA’s National Priorities List, a collection of the most polluted sites in the country.

Earlier this year, a Drummond Company executive and an attorney working for the company were convicted of bribery and other charges related to their efforts to oppose the listing, and to oppose efforts to expand the 35th Avenue site into new areas. Glenn and Phillips both testified during that trial and court exhibits detailed their work as consultants for the defendants. Phillips was a member of the Alabama Environmental Management Commission at that time, while Glenn was a private consultant and registered lobbyist.

Glenn and Phillips are charged with multiple violations of Alabama’s Ethics Act, including soliciting a thing of value from a principal, lobbyist or subordinate, and receiving money in addition that received in one’s official capacity.

*This story will be updated.