Villagers Disappear At Night

Playing Vanilla Minecraft on the latest snapshot (15w33c) on a LAN world with one other player. We found a village with a lot of villagers. At night, the villagers began going into houses like usual. I was in a forest away from the chunk containing the village. My brother died in the village and respawned away from it. When we returned to the village (still night time), all the villagers were gone. The houses were empty, not even zombie villagers. Zombies still walked up to the doors of the buildings as if villagers were inside, but there were no villagers.