He was part of an away team that visited the cormaline rich Torga IV to assess the possibility of establishing a mining operation there. T'Lor was killed by a Jem'Hadar strike force after the Starfleet officers found a crashed Jem'Hadar ship.
Sisko found himself unable to work on his official report documenting the incident, as he kept re-reading T'Lor's name on the casualty list, along with the other 4 dead. Jadzia reminded Sisko that he and the others were proud to wear the Starfleet uniform and serve under Sisko. (DS9: "The Ship")