Oregon Attorney General Ellen Rosenblum is leading the investigation into Sunriver Police Chief Marc Mills, who was placed on paid administrative leave Sunday for undisclosed reasons.

Deschutes County District Attorney John Hummel announced the state attorney general’s involvement Thursday.

“Attorney General Ellen Rosenblum is heading the fact-gathering phase of the investigation into the allegation against Sunriver Police Chief Marc Mills,” Hummel said in a statement. “Once she completes her work, she will provide me with the facts as determined by her investigation and I will decide whether to initiate criminal charges. I will comment further when the Attorney General completes her investigation.”

Rosenblum had no public comment Thursday on the investigation.

The Sunriver Service District Managing Board placed Mills on leave but won’t say what prompted the action. The board met in executive session Tuesday to further discuss the issue.

Bend Police Chief Jim Porter assigned Capt. Cory Darling to fill in as the interim Sunriver chief. Porter said he was told the investigation is focused on Mills’ work in Sunriver and not on his time in the Deschutes County Sheriff’s Office.

Mills was a captain with the sheriff’s office, where he worked for 38 years.

In 2012, Mills was selected to take over as Sunriver police chief, after the board fired former chief Michael Kennedy, who the board said at the time was poorly suited to take on a planned expansion of public relations efforts.

Mills’ annual salary is $105,882.

— Reporter: 541-617-7820, kspurr@bendbulletin.com