N.Y. Penal Law § 215.13

§ 215.13 Tampering with a witness in the first degree.\n A person is guilty of tampering with a witness in the first degree\nwhen:\n 1. He intentionally causes serious physical injury to a person for the\npurpose of obstructing, delaying, preventing or impeding the giving of\ntestimony in a criminal proceeding by such person or another person or\nfor the purpose of compelling such person or another person to swear\nfalsely; or\n 2. He intentionally causes serious physical injury to a person on\naccount of such person or another person having testified in a criminal\nproceeding.\n Tampering with a witness in the first degree is a class B felony.\n