Of course Mr. Green is the murderer. Just consider the evidence:
"1. He constantly says "I didn't do it" (reverse psychology/denial)
2. None of the accomplices are connected to him.
3. When they pair up to search the house, he goes with Yvette. The plan is that whoever of the 8 die, the killer is that persons pair. Of the eight, only Yvette dies (before Wadsworth decides to explain it all).
4. He is the only one that gets blood on his hands.
5. He is the only one that explains his "blackmail" (gay, works for state dept). Wadsworth explains everyone elses (and is surprised by Green's story).
6. As Wadsworth explains the solutions, Green is the only one not shown killing someone, or accused of killing (White - husband, Scarlet - Yvette & Cop solution 1, Mustard - motorist, Peacock - cook &
solution 2, Plum - fake Mr. Body) "
I'm going to go to Bridgewater and sleep with my girlfriend.
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"And lo, the beast looked upon the face of beauty. And beauty stayed his hand. And from that day on, he was as one dead."