Natasha Yar (AT-15)

"'Guinan says I died a senseless death in the other timeline. I didn't like the sound of that, Captain. I've always known the risks that come with a Starfleet uniform. If I'm to die in one, I'd like my death to count for something.'""-Natasha Yar, 2366"Lieutenant Natasha Yar was a Human Starfleet officer who served as tactical officer on the USS Enterprise-D during the height of the Federation-Klingon War in the mid-2360s. When the Enterprise encountered its predecessor, the USS Enterprise-C from a temporal rift, Yar travelled back with the Enterprise-C to 2344, changing history. She was captured and imprisoned by Romulan forces before being executed in 2349.

Star Trek: The Next Generation

 * Season 3
 * "Yesterday's Enterprise"