On a remote, mysterious island there are three kinds of people: Knights, who always tell the truth; Liars, who always lie and Spies, who may answer in any order that they see fit.

Riley, who is visiting the island has come face to face with 3 people. One of them wears blue, one wears red and one wears green. Riley knows that one of them is a knight, one is a liar and the remaining one a spy. He inquires who amongst the three individuals is a spy. They respond as follows:

• The man wearing blue says, "That man in red is the spy."
• The man wearing red says, "No, the man in green is the spy."
• The man wearing green says, "No, the man in red is in fact the spy."

Of the three island dwellers, identify the knight, the liar, and the spy, providing valid reasoning.