After Eponine delivers Marius’ farewell letter to Cosette, she decides to go to the barricades to be with Marius. At this point, she’s lost all care for her life so long as Marius loves another woman.
As sad as Eponine’s story is, like Fantine, she gets a bittersweet ending. She is shot while climbing the barricade to get to Marius. In her final moments, Marius is able to hold her and love her and she is comforted before she passes on.
Below is a theatrical version of Eponine and Marius’ final song. (It’s harder to envision someone dying when they are singing into a microphone.) “Little Fall of Rain” is one of my favorite songs from Les Miz.