The assistant of the Tanugan scientist Nel Apgar, whose evidence about her employer's suspicions is replayed on the holodeck in A Matter of Perspective.
Tayna is a Tanugan scientist who works with Doctor Nel Apgar on the research station orbiting Tanuga IV, where he is trying to develop a Krieger wave converter for the Federation. She appears in the third-season episode A Matter of Perspective.
After the station explodes moments after Riker beams away, killing Apgar, the investigator Krag seeks Riker's extradition for murder. Tayna did not witness the events of the previous night, but she gives evidence of what Apgar told her, and her account is recreated on the holodeck alongside those of Riker and Manua Apgar.
Picard objects that this is hearsay. Her testimony nevertheless helps reveal that Apgar had been lying about his progress and tried to kill Riker himself.