T-Dog dies in Season 3, Episode 4 of The Walking Dead.

In Season 3 of The Walking Dead, T-Dog’s death occurs in Episode 4 titled “Killer Within.” This episode is a pivotal moment in the series as it marks the end of T-Dog’s journey. The group is facing a walker invasion at the prison, and during the chaos, T-Dog sacrifices himself to save Carol. He is bitten by a walker while trying to secure a gate, and instead of letting himself turn into a walker, he chooses to lock himself in a room with walkers, allowing Carol to escape. T-Dog’s death is a heartbreaking moment for the group, and his sacrifice serves as a reminder of the dangers they face in their post-apocalyptic world.