Clementine tell's Luke that everyone around her dies. Her parents, Sandra, Duck, Carley, Lee, ETC. Also when Omid gets killed because she left the gun and backpack on the sink. Also I'm 100% sure it's Krista that Clementine thought was dead. Why? Because the bandit on the river was laying next to the bag. Krista probably surrendered and joined Carvers group. How else was the bandit able to get the backpack. Christa probably gave it to him to find Clementine . The group that attacked Clem and Krista was apart of Carver's group had to be.