Indiana Code Title 3. Elections § 3-13-2-10

Sec. 10. (a) Subject to IC 3-8-8-7, a person who was defeated in a primary election or in a town or state convention is eligible to be appointed by the political party that the person affiliated with by voting in the most recent primary election held by that party.  The person selected may fill any vacancy on the party's ticket as a candidate in any general, municipal, or special election following that primary election or convention in which the vacancy occurred.

(b) Subject to subsection (c), a person is not disqualified from appointment under subsection (a) for not having voted in the most recent primary election if the appointee is certified as a member of that party by the county chairman for the county in which the appointee resides.

(c) A person described in subsection (a) may not be appointed to fill a vacancy by a political party that differs from the party with which the person affiliated when the person was defeated in the primary election or in the town or state convention.