Okay this is the situation. We had a swarm arrive late yesterday afternoon. We shook them into a hive body and found a nice large queen. We put in pulled comb frames and added a queen excluder on the bottom so they wouldn't leave. ( We've had 3 swarms just up and leave after a couple of days this year already). This morning we have a dead queen and no bees why would they leave her? Did they kill her? Help! We are having queen problems this year as well. They are laying and then they are just gone. Any thoughts would be appreciated.