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")
Background information Edit
T'Lor was played by stunt actor Ken Lesco who received no credit for this appearance.
Although it was not established in dialogue, the script notes established his species, and described that he was "a Tiburonian with a somber disposition." Also, T'Lor has the enlarged ears common to natives of that world.