Talli is a Mari produce seller befriended by Neelix in Random Thoughts, whose killing in the marketplace shows that violent thoughts are still circulating after B'Elanna Torres has been arrested.
Talli appears in the fourth-season Voyager episode Random Thoughts, set on the homeworld of the telepathic Mari, who have outlawed violent thought and believe they have eliminated crime.
She keeps a stall in the market, and Neelix, charmed by her, is working up the courage to ask her to spend time with him. Their friendship is cut short when she is stabbed to death in the square by another Mari who has been overwhelmed by a violent image.
By then B'Elanna Torres is already in custody for a moment of anger blamed for an earlier attack. Talli's death convinces Tuvok that the thought is being passed around deliberately, and his enquiries lead him to Guill and an illicit trade in forbidden imagery.