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I would just disclose all the information you have to the new potential owners. Tell them what you have personally witnessed and tell them it is possible he caused the death of your other hen but you can't be completely sure. If they decide to take him then you know they were fully informed. Not...

So sorry for your loss. I agree that you'll just have to make a guess on this without getting a necropsy. One clue to it being the drake would be if there are feathers missing from the back of the neck. But if you haven't seen the drake being excessively aggressive with the hens I would hesitate...