Rescue workers discovered the body on Tuesday of the fourth of six Kentucky fisherman believed killed when their small boat was obliterated in a fog-shrouded, predawn collision with a barge tow. U.S. Coast Guard officials identified the missing men as John Beatty, Jr., 34, of Louisville, and Benny Burgan, 43, of nearby Crestwood, Kentucky. They were confident the remaining victims from Sunday's accident on the Ohio River would be found within a couple of days. A Coast Guard investigation centered on how the boat happened to float into a commercial shipping lane about 30 miles (48 km) upstream from Louisville. The officials said the six fishing buddies had set out from Westport…