A CHOOSE-your-own-ending style episode of Hawaii Five-O will air on Network Ten tonight.
In an Australian television first, viewers will see one of three endings chosen by votes cast in each state.
In the episode, the Five-O team is investigating the death of an O'ahu State University Professor. Viewers get to decide whether his boss, one of his students or his teaching assistant committed the crime.
Viewers can vote online at Ten's website or on Ten's Zeebox app up through the first half hour of tonight's episode, which airs at 9.30pm.
The show, now in its third series, stars Aussie actor Alex O'Loughlin, Scott Caan, Grace Park and Daniel Dae Kim.