The partial defence - scrapped by other Australian states years ago - was also successfully raised at the trial of Patrick Peterson, 36, and Seamus Smith, 26, who fatally bashed a 62-year-old hitchhiker, Stephen Ward, six months after Ruks was killed. In the Ruks case, his mother insisted he was not gay.
Defendants have argued that the sexual advance provoked them to such a degree that they were not fully responsible for their actions.
Kelly has collected more than 224,000 signatures on a petition calling on the state Government to revoke the defence. The new Labor Government has promised to abolish it, but has not yet announced a timetable for reform.
As well as gay rights organisations, local media have called for the defence to be struck out. Even Bill Potts, a criminal lawyer who has successfully used it in a murder trial, told the Courier Mail the defence was "archaic, homophobic and often unreasonable".
An editorial in the Fraser Coast Chronicle said: "It's hard to believe a defence like this could still exist in these so-called enlightened times, particularly when men of the cloth - not always known as the greatest friends of the gay and lesbian community - can clearly see the bigotry, prejudice and intolerance inherent in this defence."
The paper added: "It should be clear to everyone - particularly lawmakers. It's time this defence was consigned to the past once and for all."