The Alameda County district attorney has filed criminal charges against the former head of the special agency that oversees the Oakland Coliseum complex for allegedly violating state conflict-of-interest laws while negotiating the naming rights of the stadium.

Scott McKibben was charged with a felony and misdemeanor count of violating conflict-of-interest laws by seeking a $50,000 payment for helping negotiate a settlement for the Coliseum naming rights with RingCentral, according to charging documents.

In a text message to The Chronicle, McKibben said that neither he nor his attorney have been alerted of the charges. He declined to comment further.

The charges were filed Nov. 27.

In June, the name of the home of the Oakland A’s and Raiders was changed to RingCentral Coliseum by the Oakland-Alameda County Coliseum Authority, which McKibben then headed. Under the deal, RingCentral, a Belmont communications firm, pays the authority $1 million a year for the next three years to have its name on the stadium.

In August, McKibben abruptly resigned amid questions about a possible conflict of interest in the naming rights deal. The decision was made in a closed-door meeting of the agency, which is subject to state regulations that bar government officials from personally benefiting from their decisions.

“There are some people who felt that there was a possible conflict of interest in the awarding of the naming rights deal,” McKibben told The Chronicle at the time.

Employees at RingCentral had their first site visit at the Coliseum at the end of 2018 and were told by McKibben that his fee for negotiating the naming rights is $50,000 if the negotiations were approved, according to court records. McKibben sent three emails to RingCentral — on June 17, June 20 and June 25 — each with a different invoice for $50,000, according to court documents.

The commissioners of the Coliseum Authority told prosecutors they were not aware of that McKibben had sought a fee, prosecutors said. The authority’s joint counsel learned of McKibben’s fee request on June 26 and after notifying RingCentral of the conflict of interest, the fee was not paid.

Upon learning of McKibben’s financial interest, the Coliseum Authority is seeking to renegotiate the naming rights of the Coliseum, prosecutors said.

Prosecutors said that in an interview, McKibben admitted to negotiating a $50,000 deal.

Sarah Ravani is a San Francisco Chronicle staff writer. Email: sravani@sfchronicle.com @SarRavani