Man, that season 3 wrap-up still hits me in the chest. In the TV version of 'The Walking Dead', Andrea's story ends during the chaos surrounding the Governor's assault on the prison in the season three finale, 'Welcome to the Tombs'. She had spent a lot of time split between the prison group and Woodbury, trying to find a middle ground, but when the Governor's lies and violence escalated everything went south. During the fighting and the confusion she was bitten by a walker while trying to escape or protect others — it’s one of those brutal, messy moments the show does so well.
She doesn’t get a slow, off-screen fade; instead, Andrea dies surrounded by people who care in a grim, intimate way. Michonne is with her as she faces the infection, and rather than risk reanimation she takes matters into her own hands and shoots herself to prevent turning. That sequence is raw and sad, especially because the TV Andrea's arc was so different from the comics where she survives much longer. Watching Laurie Holden’s performance in that scene — the regret, the stubbornness, the acceptance — I remember sitting on my living room floor with friends, totally stunned and arguing for hours afterward about whether the Governor deserved that level of sympathy or hatred.
If you want the clearer beats: season three, finale episode 'Welcome to the Tombs', bitten during the Governor-related chaos, and then she ends her life with Michonne present so she won’t turn. It’s one of those moments that sparks heated debates — I still go back and rewatch the arc when I’m in a bleak mood, just to feel that messy mix of anger and melancholy again.