The chairman of the Missouri Gaming Commission, Jim Mathewson, will announce he's stepping down tomorrow, according to commission spokeswoman LeAnn McCarthy.
Mathewson, of Sedalia, Mo., has been on the Gaming Commission since 2009 and was chairman for most of his tenure there. Previously, he served as a Missouri state representative and then state senator. He served as the Senate's President Pro Tem for eight years.
Matthewson's term had expired on April 29, 2012, but McCarthy said she did not know if that was related to his decision to resign.
Gov. Nixon is responsible for naming Mathewson's replacement, which will require Senate confirmation. When contacted by St. Louis Public Radio, Nixon would not comment on possible nominees.