I don't know why I am the only person on this forum who has to have an unseemly wrangle with a bunch of hysterical and biased women, and others with no sense of abstract justice about the MacDonald case. Mitchell confessed several times, but he was disregarded, and he passed a mumbo-jumbo polygraph. It was not only Stoeckley who confessed as JTF suggests. There was exculpatory evidence, but it was withheld from the jury and the MacDonald defense team, and there was also manufactured evidence by the FBI. I suppose the forensic evidence does not point directly at any names, as JTF says, but that is not unusual in difficult murders.
There have been murder cases in the past where fingerprints were found which pointed directly at the real culprit.
There is some background to all this at this website: