S1E22 - Skin of Evil - 23/04/1988
Captain's log, stardate 41601.3. Oooo, Yar is going to participate in a martial arts tournament, wooptiedoo. Shuttlecraft 13 crashlanded on Vagra II. O wait! This is the one where Yar des! Yay! The blob. A super annoying character, but
you gotta like him for getting rid of Yar. Lol, Picard asks what the status is, Crusher waves her tricorder over Yar for about 10 seconds, all the while it beeps faster and faster until she says "she's dead". Didn't even try to save her. Let's beam her to the ship and confirm she is really dead. Yep. So much for martial arts. I guess Worf lost the pool. But then he received a promotion to acting chief of security. Not a total loss. Picard orders everyone not to have feelings for Yar, at least not right now.
She wasn't even wearing a red shirt. Troi is in the crashed shuttlecraft. She is trying to wear the blob down by talking to it. Uh oh, Riker got blobbed. The blob's name is Armus by the way, not that it matters. A bunch of talking later, Troi and the other guy on the shuttlecraft named Ben have been saved. We have to suffer through a bit more of Yar as apparently she recorded a hologram of herself, telling each individual crew member what she thought of them.