(1) Unavailability as a witness includes situations in which the declarant:

(a) Is exempted by ruling of the judge on the ground of privilege from testifying concerning the subject matter of his statement; or

(b) Persists in refusing to testify concerning the subject matter of his statement despite an order of the judge to do so; or

(c) Testifies to lack of memory of the subject matter of his statement; or

(d) Is unable to be present or to testify at the hearing because of death or then existing physical or mental illness or infirmity; or

(e) Is absent from the hearing and the proponent of his statement has been unable to procure his attendance by process or other reasonable means.

A declarant is not unavailable as a witness if his exemption, refusal, claim of lack of memory, inability, or absence is due to the procurement or wrongdoing of the proponent of his statement for the purpose of preventing the witness from attending or testifying.

(2) Subject to the provisions of section 27-403, the following are not excluded by the hearsay rule if the declarant is unavailable as a witness:

(a) Testimony given as a witness at another hearing of the same or a different proceeding, or in a deposition taken in compliance with law in the course of the same or a different proceeding, at the instance of or against a party with an opportunity to develop the testimony by direct, cross, or redirect examination, with motive and interest similar to those of the party against whom now offered;

(b) A statement made by a declarant while believing that his death was imminent, concerning the cause or circumstances of what he believed to be his impending death;

(c) A statement which was at the time of its making so far contrary to the declarant’s pecuniary or proprietary interest, or so far tended to subject him to civil or criminal liability or to render invalid a claim by him against another, that a reasonable man in his position would not have made the statement unless he believed it to be true. A statement tending to expose the declarant to criminal liability and offered to exculpate the accused is not admissible unless corroborating circumstances clearly indicate the trustworthiness of the statement;

(d)(i) A statement concerning the declarant’s own birth, adoption, marriage, divorce, legitimacy, relationship by blood, adoption, or marriage, ancestry, or other similar fact of personal or family history, even though declarant had no means of acquiring personal knowledge of the matter stated; or (ii) a statement concerning the foregoing matters, and death also, of another person, if the declarant was related to the other by blood, adoption, or marriage or was so intimately associated with the other’s family as to be likely to have accurate information concerning the matter declared; or

(e) A statement not specifically covered by any of the foregoing exceptions but having equivalent circumstantial guarantees of trustworthiness, if the court determines that (i) the statement is offered as evidence of a material fact, (ii) the statement is more probative on the point for which it is offered than any other evidence which the proponent can procure through reasonable efforts, and (iii) the general purposes of these rules and the interests of justice will best be served by admission of the statement into evidence. A statement may not be admitted under this exception unless the proponent of it makes known to the adverse party, sufficiently in advance of the trial or hearing to provide the adverse party with a fair opportunity to prepare to meet it, his intention to offer the statement and the particulars of it, including the name and address of the declarant.