N.Y. PEN. LAW § 215.12 : NY Code - Section 215.12: Tampering with a witness in the second degree

A  person  is  guilty of tampering with a witness in the second degree
  when he:
    1. Intentionally causes physical injury to a person for the purpose of
  obstructing, delaying, preventing or impeding the giving of testimony in
  a criminal proceeding by such  person  or  another  person  or  for  the
  purpose of compelling such person or another person to swear falsely; or
    2.  He  intentionally causes physical injury to a person on account of
  such person or another person having testified in a criminal proceeding.
    Tampering with a witness in the second degree is a class D felony.