Tobolski, who doubles as mayor of McCook, had his McCook Village Hall offices searched by federal agents in September.
Cook County Commissioner Jeffrey Tobolski resigned Friday from the Cook County Board, according to a letter obtained by the Chicago Sun-Times.
Tobolski submitted his letter of resignation to Board President Toni Preckwinkle. The resignation is effective March 31.
Tobolski, who is also the mayor of McCook, saw his McCook Village Hall offices searched by federal agents in September.
That raid was part of a suburban squeeze that came days after federal agents raided the home and offices of former Democratic state Sen. Martin Sandoval. A source told the Chicago Sun-Times the raids were related.
This is a developing story.