Manhattan defense attorney Robert Simels and his former associate Arienne Irving will be sentenced this afternoon for their roles in a conspiracy to threaten witnesses on behalf of Mr. Simels’ client, Guyanese drug kingpin Shaheed Khan.

Mr. Simels, 62, and Ms. Irving, 31, were convicted in August of 12 and five felonies, respectively, including attempted witness tampering and conspiracy to commit witness tampering.