Bad ending: Talia Winters

Talia Winters was a psychic (telepath) on Babylon5, and this episode i'm mentioning killed her off as a main good-guy character.
Security rescued a ship that appeared and found another telepath, Anita, on board and unconsiousess.
When she woke in medical bay, Franklin tried to ask her what happened but she screamed at him that she didn't trust being alone with anyone on Babylon 5, and she wanted to see the captain. 'One of you is a traitor and i can prove it.' she said.
After the usual talking, etc,she explained to John Sheriden, Susan Ivanova, Dr. Franklin nd Mr Garibaldi that there was someone on the ship who didn't know it, but had another personality inplanted by an organisation know n as Psy-corps, that wanted info about Babylon 5 and left the personality deep in their mind to be awakened when needed. So the person would betray them for Psy-corps because he or she would be taken over by the personality. And once the personality takes over, the person's real one would be lost forever.
Anita had a 'password' she could send from her mind into the mind of others. If the person was the one, they would react to it and the personality would take over.
After sending it to everyone closer to the main authorities on the ship, she couldn't find it.
They were about to stop when Talia Winters entered to see Susan, her friend, and Anita sent the password.
Talia reacted. She screamed and held her hands to her head. Then suddenly she was different. She pulled out a gun and tried to shoot them and Garibaldi managed to disarm her. All along as she was dragged out by security to be put under house arrest, she was screaming at them "We'll find you! You blew my cover! Psycorps will find you, Anita Alexandra!"
The real character was suddenly gone.
Just poof, and no more good-guy telepath. It sucks. I kind of grew on all the characters and all of a sudden one is gone.
Instead the new personality took over.
When Susan, Talia's good friend, went to see her, hoping that somehow the real Talia was in there somewhere and she could tell her it wasn't really her fault because she didn't know she had it all in her head, the new Talia told her how the real Talia was dead. She was gone, and Susan was stupid, incompetent and naive, to have let herself become so close to her.
"You believed evrything she said," Talia said, refering to her old self, "Everything you wanted to hear, i whispered to Talia when she was asleep at night. Like her invisible sister." And ended with, "Goodbye, my dear sweet friend." In a sarcastic and proud tone.
Susan looked slapped, then just said before walking out, "You were right...Talia is dead."
She kind of lost one of her closest friends.