In the Walking Dead S4E07, Phillip (who now goes by Brian) Is on a supply hunt with the camp people that got him and Brian's step daughter out of the walker pit.
The 3-4 men come across another camp with about ten surrounded by wire, and consider looting them and robbing them of their supplies. But the apparent leader said they go find their own supplies.
They are on the same hunt, same day and time when they circle back and are surprised to see the people at the camp dead.
They weren't killed by walkers because the walkers would have had a nice meal out of them and stayed.
Who killed the camp people?