NEW YORK — A CBS News employee has been indicted in an alleged blackmail plot against David Letterman.

Manhattan District Attorney Robert Morgenthau announced the indictment Friday against Robert “Joe” Halderman.

Morgenthau says his office used an undercover sting operation to catch Halderman.

Letterman says he found a package of embarrassing e-mails and photos in his limousine.

His attorney took the evidence to the prosecutor’s office office, which set up an undercover sting at a hotel.

New York police detectives were in an adjoining room with recording equipment and surveillance.

Halderman was part of a team nominated for an Emmy for outstanding continuing coverage of a news story in a news magazine in 2008. Two numbers listed for Halderman were disconnected, and a message left at a third number was not immediately returned Thursday.

The Manhattan district attorney has scheduled a news conference for late Friday morning to talk about the arrested employee, who the DA says is from Connecticut.