Since the comic is obviously different, I will say what happened there. When Woodbury and the Governor attacked, Lourie was running with the baby and someone shot through Laurie and the baby killing them both. And when the Woodbury people realize the governor lied to them and basically got them to slaughter innocent people, a woman turned the gun and shot him in the head.
I'm just happy they showed neither. We discussed a couple of options: 1. Zombie got her 2. on the bus or 3. other death not shown...