Here are the relevant select sections of the Wyoming Will Code which govern Wills and Will requirements in the state of Wyoming:
CHAPTER 6 – WILLS
ARTICLE 1 – IN GENERAL
2-6-101. Right to make and dispose; exception.
Any person of legal age and sound mind may make a will and dispose of all of his property by will except what is sufficient to pay his debts, and subject to the rights of the surviving spouse and children.
2-6-112. Will to be in writing; number and competency of witnesses; signature of testator; subscribing witness not to benefit; exception.
Except as provided in the next section, all wills to be valid shall be in writing, or typewritten, witnessed by two (2) competent witnesses and signed by the testator or by some person in his presence and by his express direction. If the witnesses are competent at the time of attesting the execution of the will, their subsequent incompetency shall not prevent the probate and allowance of the will. No subscribing witness to any will can derive any benefit therefrom unless there are two (2) disinterested and competent witnesses to the same, but if without a will the witness would be entitled to any portion of the testator’s estate, the witness may still receive the portion to the extent and value of the amount devised.
2-6-113. Holographic will.
A will which does not comply with W.S. 2-6-112 is valid as an holographic will, whether or not witnessed, if it is entirely in the handwriting of the testator and signed by the hand of the testator himself.
2-6-115. Who may witness.
Any person generally competent to be a witness may act as a witness to a will.
2-6-116. Validity of execution.
A written will is valid if executed in compliance with W.S. 2-6-112 or 2-6-113 or if its execution complies with the law at the time of execution of the place where the will is executed, or of the law of the place where at the time of execution or at the time of death the testator is domiciled, has a place of abode or is a national.
2-6-117. Revocation by writing or by act.
(a) A will or any part thereof is revoked:
(i) By a subsequent will which revokes the prior will or part expressly or by inconsistence; or
(ii) By being burned, torn, cancelled, obliterated or destroyed with the intent and for the purpose of revoking it by the testator or by another person in his presence and by his direction.
2-6-118. Revocation by divorce or annulment; effect; revival; other changes excluded.
If after executing a will the testator is divorced or his marriage annulled, the divorce or annulment revokes any disposition or appointment of property made by the will to the former spouse, any provision conferring a general or special power of appointment on the former spouse, and any nomination of the former spouse as executor, trustee, conservator or guardian, unless the will expressly provides otherwise. Property prevented from passing to a former spouse because of revocation by divorce or annulment passes as if the former spouse failed to survive the decedent, and other provisions conferring some power or office on the former spouse are interpreted as if the spouse failed to survive the decedent. If provisions are revoked solely by this section, they are revived by testator’s remarriage to the former spouse. For purposes of this section, divorce or annulment means any divorce or annulment which would exclude the spouse as a surviving spouse. A decree of separation which does not terminate the status of husband and wife is not a divorce for purposes of this section. No change of circumstances other than as described in this section revokes a will.
You can obtain the current and full version of the Wyoming Will Code from the Wyoming Legislative Service Office.