PORTLAND On Wednesday afternoon, the Oregon Attorney General confirmed it will immediately begin investigating Jeff Cogen.

The investigating comes at the request of the Multnomah County District Attorney and Sheriff's Office, following news Cogen had an affair with fellow county employee Sonia Manhas.

Given the attention this issue has received in Multnomah County, the district attorney and the sheriff want to ensure that the matter receives a fair and impartial viewing, Multnomah County Spokesman David Austin said.

The news of the investigation came only hours after Manhas resigned from her position as the county health department s policy and planning director Wednesday.

Cogen returned to work Monday afternoon and said he has no plans to resign from his position at the county.

More: Sonia Manhas resigns following affair with Mult. Co. Chair Jeff Cogen

In a letter sent to Oregon Attorney General Ellen Rosenblum Wednesday, Multnomah County District Attorney Rod Underhill and Sheriff Daniel Staton requested the criminal investigation.

Read: Rod Underhill s letter to Oregon Attorney General Ellen Rosenblum

As presented to the public the facts could lead some to question whether any Oregon criminal laws have been violated. Without expressing any opinion as to whether any criminal laws have been violated or not we have concluded that an investigation to answer that question is warranted, the letter says.

The county is also conducting an internal review. As part of that inquiry, they requested to see the phone records and text messages of both Cogen and Manhas.

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