Illinois Statutes Chapter 755. Estates § 35/5. Revocation

(1) By being obliterated, burnt, torn or otherwise destroyed or defaced in a manner indicating intention to cancel;

(2) By a written revocation of the declaration signed and dated by the declarant or person acting at the direction of the declarant, regardless of whether the written revocation is in electronic or hard copy format;

(3) By an oral or any other expression of the intent to revoke the declaration, in the presence of a witness 18 years of age or older who signs and dates a writing confirming that such expression of intent was made; or

(4) For an electronic declaration, by deleting in a manner indicating the intention to revoke. An electronic declaration may be revoked electronically using a generic, technology-neutral system in which each user is assigned a unique identifier that is securely maintained and in a manner that meets the regulatory requirements for a digital or electronic signature. Compliance with the standards defined in the Uniform Electronic Transactions Act  1 or the implementing rules of the Hospital Licensing Act  2 for medical record entry authentication for author validation of the documentation, content accuracy, and completeness meets this standard.