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?

I think it is Bart as:

The first question they must of all answered yes because they all gave the same answer. which means that at the next question there will be three telling the truth and one lying.

soo we know that either Bart is or Abbey is the killer.

next we know that Cody and Dean are telling the truth so that means that it must be bart for the other comments to be true.

Genesis