An inhabitant has been killed in Knavesville and the Sheriff has interrogated four suspects. It is known that one of them is the killer. As is expected of Knaves, they alternated between telling the truth and lying (Not necessarily in that order).

Each suspect was first asked if he was the killer, to which the sheriff got the same answer from all the four suspects.

He then asked them, 'Who was the killer?' The answers to which are shown below.

Abbey said: Bart is the killer.
Bart said: Dean is the killer.
Cody said: Bart is lying when he says Dean is the killer.
Dean said: If Abbey did not kill him, then Bart did.

Who was the killer?

(In reply to Solution by Tweedy)

Though it doesnt contradict directly, you still have to remember that it is the second question.  For Bart to be telling the truth this time and everyone else lying, then on the first question, Bart would have been lying and would have said 'yes' he was the murderer, while the others could not all tell the truth and say 'no' htey werent the murderers, because Dean would have had to say 'yes' and that no longer fits the first question.

Posted by trey on 2007-03-21 00:46:11