BOSTON — A Massachusetts state trooper was suspended without pay Tuesday after being charged with extortion for allegedly going into business with a bookmaker, demanding a lifetime share of the profits and then threatening to kill him.

John Analetto, 48, of Belmont is accused of beating and repeatedly threatening to kill the bookie, who later went to the FBI, became a confidential witness and wore a recording device.

Analetto was arrested Saturday in Belmont.

After details were made public Tuesday in an FBI affidavit, Analetto made a brief appearance in U.S. District Court. U.S. Magistrate Judge Marianne Bowler ordered him held in the custody of federal marshals until Friday, when a bail hearing will be held.