In Katharyn Powers’ original script, Kira and Tahna were to be lovers, but Michael Piller decided that this was a television cliché. Powers’ version also had Tahna turning his back on terrorism and attempt to forge peace with the Cardassians, before being killed by his own people. (Captains’ Logs Supplemental - The Unauthorized Guide to the New Trek Voyages, p 41)

http://memory-alpha.wikia.com/wiki/Past_Prologue_(episode)