
The office that polices lawyers in the District of Columbia is investigating whether prominent lawyer Joseph E. diGenova violated ethics rules by falsely claiming he supervised the federal prosecution of John W. Hinckley Jr., who tried to assassinate President Reagan, sources said.

Prominent D.C. lawyer Joseph E. diGenova has billed himself as a battle-tested former prosecutor who supervised the high-profile prosecution of John W. Hinckley Jr., who tried to kill President Reagan. But Mr. diGenova had no role in the prosecution or the trial, according to court records and those who did prosecute the case.