The Missouri ER doctor who mysteriously disappeared last week was found dead from a gunshot wound in an Arkansas lake, authorities confirmed Wednesday — as his brother said the devoted healthcare worker may have been in danger because he had previously been kidnapped. Dr. John Forsyth’s body was found Tuesday by a kayaker in an Arkansas lake — about an hour south of where he was last seen in Cassville, Missouri — with what appeared to be a gunshot wound, the Benton County Sheriff’s Office said in a release. Cassville Police Captain James Smith told The Post that the 49-year-old’s...