Tennessee Code Title 2. Elections § 2-15-104

(c)(1) The electors shall cast their ballots in the electoral college for the candidates of the political party which nominated them as electors if both candidates are alive.

(2) If the presidential candidate of the party is dead or both the presidential and vice presidential candidates of the party are dead, the electors may cast their ballots in the electoral college as they see fit.

(3) If the vice presidential candidate of the party is dead, the electors shall cast their ballots in the electoral college for the presidential candidate of the political party which nominated them as electors but may cast their ballots in the electoral college for vice president as they see fit.