When a psychiatrist was found murdered in his apartment, four of his patients were questioned about his death.
I. The police knew from the testimony of witnesses that each of the four patients had been alone with the psychiatrist in his apartment just once on the day of his death.
II. Before the four patients were questioned, they met and agreed that every statement each of them would make to the police would be a lie.
Each patient made two statements, as follows:
Avery:
1. None of us four killed the psychiatrist.
2. The psychiatrist was alive when I left.
Blake:
3. I was the second to arrive.
4. The psychiatrist was dead when I arrived.
Crown:
5. I was the third to arrive.
6. The psychiatrist was alive when I left.
Davis:
7. The killer did not arrive after I did.
8. The psychiatrist was dead when I arrived.
Which one of the four patients killed the psychiatrist?
December 6th, 2010 | Category: 
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Way too many possibilities lol. They could lie for ex. ‘The psychiatrist was alive when I left’ when the truth can be:
1. The psychiatrist was dead when I left
3. The psychiatrist was dead when I arrived
4. The psychiatrist was alive when I arrived
Hint: We know that all statements are false.
Keep trying.
i think the killer is Blake.
The order that the suspects visited the psychiatrist : Davis,Crown,Avery,Blake.
Avery
Avery is correct, Dustin.
Logic:
First, since we know they are all lying, change the meaning of each statement as follows:
Avery:
1. One of us four killed the psychiatrist.
2. The psychiatrist was dead when I left.
Blake:
3. I was not second to arrive.
4. The psychiatrist was alive when I arrived.
Crown:
5. I was not third to arrive.
6. The psychiatrist was dead when I left.
Davis:
7. The killer arrived after I did.
8. The psychiatrist was alive when I arrived.
It makes sense that the first two to arrive are the two who saw him alive – Davis and Blake
Blake was not second, so he was first.
The killer arrived after Davis, so he was not the killer.
This leaves Avery and Crown… Crown wasn’t third, so he was last.
The order is as follows:
Blake (alive when arrived)
Davis (alive when arrived)
Avery (dead when left)
Crown (dead when left)
Thus, Avery must have killed the psychiatrist.
Great job, you’re today’s winner.
Way cool! Some extremely valid points! I appreciate you
writing this article and the rest of the site is very good.
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What is the answer? Anyone?!
What is the answer tho? Anyone?!
What is the answer?