A former firefighter for Prince George’s County pleaded guilty to bribing state and local officials, according to court documents unsealed by the U.S. Attorney’s office Monday. Karl Granzow’s plea is the latest to be released in the investigation of the pay-to-play schemes that engulfed former County Executive Jack Johnson and his wife, Councilwoman Leslie Johnson.

Granzow, a resident of Upper Marlboro, Md. who was responsible for the Prince George’s County fire department’s Management Services Command at the time of the briberies, had ownership interests in Greenbelt Metropark, a company trying to design and build a mixed-use project near the Greenbelt Metro Station. Granzow’s fellow conspirators, Daniel Colton and Patrick Ricker, also pleaded guilty to the charges against them.