A bus driver, Peter , is celebrating his 50th birthday at a karaoke. After having several glasses of non-alcoholic drinks, he goes to the washroom. on his way to the washroom in a long hallway, he hears a man's really loud voice coming out from a room. " Oh please. I didn't do it. I really didn't do it. John didit. PLease don't shoot me , Mary." Then he hears a gunshot. He immediately peks in through the little window on the doorand sees a dead man and a gun on the floor. At a corner of the room, he sees three people standing : a fireman, a nurese and a doctor. The police arrive and question Peter, " Did you see who killed the man ? " " Nope, i didn't but i'm 100% sure who did it. It was the doctor." Later the doctor confesses to the murder . SO HOW DID PETER KNOW WHO THE KILLERS WAS ?
Clues :
Q: Was the man really dead>
A: Yes
Q: Could Peter tell right away what the three people did for living when he first saw them ?
A : No
Q: Was it apparent who the killer was?
A: Yes
Q: Was there anything to do with the gun or how it was placed on the floor after the gunshot?
A: No
Q: Were the three people wearing regular casual clothes?
A: Yes
Q: Did Peter know any of the three people before the murder?
A: No