Tayna

From Memory Alpha, the free Star Trek reference

Tayna was the assistant to Doctor Nel Apgar in 2366. She assisted Dr. Apgar in his research on Krieger waves.

When Dr. Apgar was killed and Riker was accused of the murder, she testified against Riker. Using a holo-simulation, she stated that Riker made advances toward Mrs. Apgar and threatened the doctor. She also said that the doctor was in fear of his life and when she wanted to contact the authorities, he told her he would take care of Riker. Riker was cleared of the crime when it was proven that Dr. Apgar had developed a weapon which he was going to sell to the highest bidder, and tried to kill Riker so he would not find out. (TNG: "A Matter of Perspective")

Tayna was played by Juliana Donald. The costume worn by Donald as Tayna was auctioned off in the It's A Wrap! sale and auction.