More Cold Blood in Cold Case?

Fascinating piece today at The Guardian on new suspicions that the two infamous In Cold Blood murderers may have gone on to kill again in Florida before they were apprehended.  In fact, they were suspects for awhile back then, but passed (possibly faulty) lie detector tests.  Their bodies may be dug up and new forensics tests done, but more than 50 years have now passed.   They had told Truman Capote that the Florida murders must have been committed by some "lunatic" copycat.  Capote's book freaked me out as a kid.  Good black-and-white movie, too.