St. John’s sophomore Jayson Williams was arrested...

St. John’s sophomore Jayson Williams was arrested after he wound up and threw a folding chair into the crowd at the Providence Civic Center Saturday after his ejection from a game.

Williams was charged with assault with a dangerous weapon after his team lost to Providence College, 90-81. He posted $150 cash bail and is scheduled to appear in court Tuesday.

The 6-foot 9-inch Williams, ejected from the game after fighting with Providence’s Abdul Shamsideen, threw the chair into the partisan crowd after he reached the bench.

Kerry Rafanelli, 29, of Warwick, R.I., who filed the complaint against Williams, was treated for a bruised left arm, police said.