Neb. Rev. Stat. § 28-919

(1) A person commits the offense of tampering with a witness or informant if, believing that an official proceeding or investigation of a criminal or civil matter is pending or about to be instituted, he or she attempts to induce or otherwise cause a witness or informant to: (a) Testify or inform falsely; (b) Withhold any testimony, information, document, or thing; (c) Elude legal process summoning him or her to testify or supply evidence; or (d) Absent himself or herself from any proceeding or investigation to which he or she has been legally summoned. (2) A person commits the offense of jury tampering if, with intent to influence a juror's vote, opinion, decision, or other action in a case, he or she attempts directly or indirectly to communicate with a juror other than as a part of the proceedings in the trial of the case. (3) Tampering with witnesses or informants is a Class IV felony, except that if such offense involves a pending criminal proceeding which alleges a violation of another offense classified: (a) As a Class II misdemeanor or a lower classification or a violation of a city or village ordinance, the offense is a Class I misdemeanor; or (b) As a Class II felony or a higher classification, the offense is a Class II felony. (4) Jury tampering is a Class IV felony, except that if such offense involves a pending criminal proceeding which alleges a violation of another offense classified as a Class II felony or a higher classification, the offense is a Class II felony.