OKLAHOMA CITY (AP) — An Oklahoma state senator resigned after he was arrested and a former governor's aide was charged Tuesday in separate investigations linked to sex scandals. These are the latest allegations against Oklahoma's ruling Republican lawmakers and others with close ties to GOP leadership in the state Capitol.

Here's a look at four cases from this year:

STATE SEN. BRYCE MARLATT

Republican state Sen. Bryce Marlatt of the western Oklahoma city of Woodward resigned from office Tuesday after being booked on one felony count of sexual battery. He was released on a $5,000 bond. Marlatt...