Thank you all for your help so far. We have not checked their vent. Didn't even think of that since both died so quickly. They are laying hens - one was a Red Star brown egg layer and the one that died today was a white silkie.
we have had 2 hens (7 months old) die approx 2 weeks apart. One day we notice that they are really fat and waddling, barely walking and the next morning we find them dead. Any ideas or help before we lose more would be appreciated.