Okla. Stat. tit. 26 § 14-110.1
A registered voter who swears or affirms that the voter is physically unable to vote in person at the precinct on the day of the election because the voter is:
may apply for an absentee ballot. Such applications may be made by United States mail, by facsimile device as defined by Section 1862 of Title 21 of the Oklahoma Statutes or by a means of electronic communication designated by the Secretary of the State Election Board or may be made in person at the office of the county election board by an agent of the voter. Such an agent shall be a person of the voter's choosing who is at least sixteen (16) years of age and who is not employed by or related within the third degree of consanguinity or affinity to any person whose name appears on the ballot. No person may be the agent for more than one voter at any election. The Secretary of the State Election Board shall prescribe a form to be used for the application, although any application setting forth substantially the same facts shall be valid. Requirements for matching of name, birth date, and identification number established pursuant to Section 14-105 of this title shall apply to applications for absentee ballots under this section.
Okla. Stat. tit. 26, § 14-110.1