The angel of the LORD went out, and smote in the camp of the Assyrians an hundred fourscore and five thousand: and when they arose early in the morning, behold, they were all dead corpses. 19:35
Seems suspicious, doesn't it? Especially when you consider how much God hated Benhadad. God killed Ahab and his family for not killing Benhadad. Maybe Hazael did the job for God when he smothered him. 8:7-15