The police pension board chairman stepped down Wednesday in the wake of the disclosure that he sent and received photos of nude women on government email accounts.

W.B. Smith, 74, will remain a trustee on the state board that oversees the $2.5 billion police pension fund.

"I want to apologize to everybody for my mistakes," Smith said at the start of the monthly board meeting.

The emails were discovered during an investigation into an anonymous tip about the travel of the executive director of the Oklahoma Police Pension and Retirement System.