Wow Patty What a great story.
When I read the bit about Bert supposedly having drunk carbolic acid I immediately thought "No that can't be right" Then getting to the bit about the sheriff's wife 'drinking' the same I thought then it had to be the sheriff who killed Bert and also his wife.
Sounds very much like the sheriff was of the type who thought because he was the law he was above the law. Glad Frank got him in the end. He didn't actually murder him did he. Just left him to sleep the drink off, just a coincidence it was freezing and the sheriff froze to death. He, the sheriff, shouldn't have drunk so much should he

Jean